yes but a rib injury will effect you footwork and your footwork directly effects you TDD
Not buying it. Footwork is probably the last thing a rib injury would effect. Getting up from bottom and sprawling? Sure. Basic footwork? Not really. Even if it did slightly effect it, the east of Sonnen getting the TD tells me that it had more to do with Sonnen's great wrestling and Silva's wrestling weakness than Silva's rib.
Silva threw a lot of good stuff standing too. If he was able to throw normal kicks / elbows than he would have been able to use normal footwork at times. Yet Chael still got him down whenever he wanted.
It's not like it was the first time that Silva has shown a weakness to TD's. Lets not kid ourselves.