Ever since it was confirmed that Jamie Foxx would be reprising his role as Electro in the third Spider-Man movie of the MCU, speculation that previous Spider-Men Andrew Garfield and Tobey Maguire could also be appearing have only grown. Many are hoping that both will return as their respective iterations of Peter Parker in a multiverse adventure, similar to Sony's animated hit, Spider-Man: Into the Spider-Verse. While neither actor has been confirmed for the upcoming sequel, one fan hopes that Maguire could be playing a slightly different role.
In one fan theory, Reddit user froglegs317 proposes that Maguire could be both his version of Peter Parker as well as a doppelganger of the MCU's Ben Parker. In other words, he would still be Spider-Man in one universe, but Maguire would also be Peter's Uncle Ben in the MCU.
A similar example of this would be John Wesley Shipp's role in CW's The Flash. Prior to the CW show, Shipp portrayed Barry Allen/The Flash in the short-lived television show of the same name in 1990. In the 2014 The Flash series, Shipp played Barry's father, Henry Allen, but he also reprised his role as The Flash during the crossover event, Crisis on Infinite Earths.
If this theory proves true, fans could finally see Uncle Ben in the MCU. Since both Sam Raimi's Spider-Man and The Amazing Spider-Man movies depicted Peter Parker's origin story and Uncle Ben's death, the MCU Spider-Man movies opted not to go over it again. As a result, Uncle Ben has only been briefly referenced in the new movies, and Iron Man stepped in as Peter's mentor and father figure.
While Spider-Man: Far From Home saw Peter dealing with the loss of Tony and looking for another mentor, it appears that he'll find a new one in Doctor Strange, who has been confirmed to be in the untitled third film. With as many mentors as Peter already has in the MCU, another one might be too much for one movie, even if it's Uncle Ben.
That being said, Uncle Ben has always been a very important part of Peter's backstory, and his omission from the new films has left some fans disappointed. Now that Tom Holland has had a chance to establish his version of the character, maybe it's time to bring Uncle Ben into the fold. Having Maguire's Spider-Man also be Uncle Ben's doppelganger might be a lot for audiences to wrap their heads around at first, but seeing his uncle as Spider-Man would surely have a huge impact on Holland's Peter Parker. Even though Sony hasn't confirmed that Maguire is involved with the project, this theory would be an interesting and unexpected way to bring him back.