Oh yeah, I'm sure he's probably playing a variant, but for me it's just surprise that Chris Evans that actor is coming back after he was supposed to be done. Same goes for RDJ even though we know he's playing a new character.
I think actors really need to stop saying they're done with a certain series or franchise, it seems like they always end up coming back. At one point after Spectre, Daniel Craig said he'd rather slit his wrists than play Bond again, and he came back for No Time to Die. Hugh Jackman is kind of borderline, because I think he left always left appearing in a Deadpool movie as a possibility, even after they said Logan was going to be his last movie. And of course now we have Downey and Evans coming back for Avengers.
I guess it all comes down to how much they're willing to stick to their word when the truckfulls of cash start rolling in, and/or a really great creative opportunity is offered.