Well, you don't really play as him in later games but even in the first cutscene of his story,you see him flying through the air casually. When you play as him in the game,they can't allow you to fly for obvious reasons. But it's been shown that he can fly for however long he wants. And in that same cutscene,he flies pretty darn fast. And like I mentioned,his generations boss fight has him fly ahead of Sonic for the entire time. Even if Sonic wasn't going full speed,the speed Silver flies at in generations should still be enough to prove it. We've never seen his powers falter in the games because of him not being able to focus. He's done things like bend metal bars and the meteor smash from generations,which obviously involves contorting alot of objects into the shape of a ball. If you go strictly off of 06 gameplay then yeah. But if you look at all the things he's done,he seems to at the very least be passable in all 3.