He does hit topspin, I think everyone does to at least some extent. He hits far flatter than anyone I hit with and we have 20 or so 4.5-5.5 guys in our group. He was in a pickle as far as needing more pop than his Prestige provided without having the ball sail on him. I think his mostly flat strokes didn't jive the best with the closed string pattern of the Prestige and the way he kills the ball it would barely clear the net and would go long
for a comparison I'd think he plays similar to like a Berdych. He kills the ball with a penetrating flatter stroke but does have topspin but less than a lot of other guys.
So with this Rebel 98 he has the same stroke but the amount of topspin on the same stroke creates more topspin so it drops in for him better.
I've strung it for him in both a full synthetic gut 17g at 60 and a hybrid of Cyberflash (M) and synthetic gut (C) at 56.
For whatever reason he was not a fan of the 95.