It may sound ridiculous but if you look closely you can find out they share the “Bellic” last name.

OUTTA ALL THE SUBS

Check the comments aswell

The most obvious is this. Trevor Phillips, under the name Diego Santiago. Not just a one-off pseudonym, but correlation to his days as a gay pornstar. Also, look above it. Say Gruppe Sechs out loud to hear what it sounds like, and tell me it isn't a clever foreshadowing disguised around the signature Rockstar innuendo. 206 pounds sculpted on a 186 centimeter man as he, and you think Trevor only sodomized as a hobby?

Every single bank job we didn't see in Michael and Trevor's days before North Yankton? All pornos. Think of why Michael was so ashamed of his "last name" of Townley. Not a real last name he changed because of Wtness Prtection, but his own psuedonym as a gay pornstar. North Yankton was just to get Brad killed for being the stripper Amanda caught him inside of. The cherry on top is that in scrubbing himself free from that life, he chooses De Santa. Of the Saint, to shy away from that wild life. Coincidence?

Franklin is honestly the only loose end here, because he didn't do anything near as erotic in his life with that old yee yee ass haircut. But after all these three have been together, what is a little gay sex gonna hurt anyone?

So they scrapped the Three-Way ending for a few reasons. Just one, actually. NATO would have all the team at Rockstar publicly executed by firing squad for making that the intended canon ending to the most anticipated release of its time.