The glute area seems to the the toss up. Flex Wheeler has had striated glutes before but that was an area he always had trouble with. Troy could get striated glutes but it might cost him a couple of pounds of muscle that he isn't willing to give up.
Flex had striated glutes partly because he competing at around 216-218 pounds (1993 Arnold and Mr. O). The 1993 Ironman he didn't and he was about 230. It is basically genetics, once he got bigger, that area, the lower back-glute-ham tie in, was trouble for him. And so it is for Melvin Anthony, who is a Flex Wheeler clone. And so does JoJo as well, DeGrimes (?), all have that Flex Wheeler-sque/Brian Buchanan physique. Which is the round full, muscle bellies. Nasser used to tease Flex and say in the mags that he had a big ass. Which has something to do with his genetics and possbily could be traced back to a certain ethnic group, possibly in Ghana, where I believe JoJo is from.