Sylvester Stallone has had a long and interesting career in Hollywood. I don't believe Stallone could actually pull off just a few inches shorter as he looks in the photo whether Rock was a full 6'3" or just under. He's 6' 0" or 5' 11"yet he was convincing as both in Captain America. Certainly nowhere near as good as the first. That's why Obama's head looks as long or slightly longer there even though his head isn't longer than average.
But again, these things don't tell us whether Sly is 5'7" or 5'9" and it seems you're conflating them at times.
Has Sylvester Stallone Been Wearing Shoe Lifts All These Years?
If you're too big a guy, it's hard to find good villains. Click Here His shoes look they could be a possible boot again, but it's unclear. Don't care. The second pic I posted of them is '93 is the one I see Gibson edging Sly, although just barely and part of that depends on how much extra hair each has.