The following article contains spoilers from Batman #123, on sale now from DC Comics.
With the war between Deathstroke and Talia al Ghul taking place on mutliple fronts, Batman has been forced to delegate to maintain a semblance of order. In Batman #123 (by Joshua Williamson, Howard Porter, Tomeu Morey, and Clayton Cowles), it was revealed that Ghost-Maker has been placed in command of Batman Inc. and given the task of safeguarding the Secret Society from Talia's forces.
Ghost-Maker's reluctance to help the criminal organization could lead to him breaking away from Batman. When he was first introduced, he was essentially a version of the Dark Knight who had no qualms about killing, viewing the vigilante hero's code as not only limiting but also self-destructive. He has since joined Batman's mission, mostly just to compete against his old friend, but their fundamental differences may push Ghost-Maker to reject the rule against killing. This in turn would continue Batman's unfortunate habit of trusting people who are too violent to work alongside him.
Batman's history with trusting others is a minefield, where there really is no telling how any one relationship will go. His most infamous example of mistrust was training Jason Todd to be Robin. While he did the right thing by taking the boy off the streets, he made a mistake by believing Jason was ready to train to become Robin.
Jason was an angry young man who had seen far more than Bruce Wayne ever had by his age. In retrospect, Batman should have seen the signs that Jason would abuse the skills he was taught. As Robin, Jason had a hard time not using excessive force on the criminals of Gotham City. In his eyes, the villains didn't deserve mercy.
This culminated in Jason possibly forcing a serial abuser off a balcony before he could evade justice due to diplomatic immunity. Years later, Jason returned as the Red Hood and murdered many Gotham City criminals, both to prove a point to Batman and to vent his own frustrations.
Another key example of Batman trusting the wrong people was in his recruitment of Jean Paul Valley, AKA Azrael. When Batman's back was broken by Bane, he had to choose a replacement to protect Gotham City in his absence, and Azrael proved to be a less than stellar choice.
Although Bruce was initally pleased with Valley's accomplishments as the new Batman, Azrael's prior conditioning eventually came to the core. This led to Valley sealing off the Batcave, cutting ties with the city, and employing more brutal tactics in his war against crime, sometimes going so far as to murder criminals without any concern for injuring bystanders. Bruce saw no choice other than reclaiming the mantle of Batman, and although he eventually forgave Azrael, he also recognized that it was ultimately his misjudgment that unleashed the unstable vigilante upon his beloved city.
To be fair, Ghost-Maker has yet to display any signs of turning against Batman. Since promising to abide by the hero's rules in Gotham, he has done an admirable job in upholding his end of the bargain. The two have even managed to establish a friendly competition, comparing vehicles, knockouts, and even bases.
However, all of these things occured when things were much more orderly in the lives of the Bat-Family. The moments of levity emerged during times when the lines were less blurry, and the stakes were much lower. This new assignment as the leader of Batman Inc. was meant to give Ghost-Maker more resources in his shared campaign against crime. Unfortunately, he is instead stuck essentially babysitting murderous villains.
Even the heroes under his employ are annoyed by this fact, with some even advocating for letting the two sides wipe each other out. While the offer may sound tempting, Ghost-Maker seems to want to honor Batman's wishes. However, his statement that they were the Secret Society's guardian angels "for now" implies that he may have other intentions for them down the road.
This could indicate that Ghost-Maker intends to coral them all in one place under the pretense of safety. It would be an ideal opportunity be rid of some of the world's most dangerous criminals in one fell swoop. If that was what he really wanted however, he could have simply defied Batman's orders and allowed the Demon's Shadow to eliminate the villains he and Batman Inc. are protecting.
Still, Ghost-Maker is a master tactician. He knows that as talented as Talia's operatives have proven to be, the people under Deathstroke's command are sure to be equally as capable. He may not have trusted that the Demon's Shadow could get the job done and wanted to have a shot at the Secret Society in the event of their failure.
This would be a major slap in the face to Batman, however, and while Ghost-Maker may not be particularly pleased with his new role, it seems unlikely that he would betray the Caped Crusader at this point. The temptation to do so would certainly be present, and he would likely have the support of most of Batman Inc., but such an action would likley be more of a hindrance than an actual help.
On the other hand, Ghost-Maker's comment of being temporary protectors might be an indicator that Batman Inc. will eventually be drawn into the Shadow War. After all, the team can only keep the Secret Society hidden from the Demon's Shadow for so long before they are eventually found. Talia's assassins are expert hunters, and will likely track down their opponents sooner rather than later. This is sure to lead to a fight between the two teams that Ghost-Maker may secretly be planning to use for his own purposes.