Tim has had very few follow throughs that were close to the one Vince Scully commented about in the first clip. Clearly he did get off balance on that one, although it isn't clear that he did so until it was obvious the ball hadn't been hit.

I guess this is something to keep a watch on, and certainly Tim's fielding position could be better after his follow-through, but I haven't seen it as a problem.

I have read of a small concern that during June Tim was falling off the mound toward first base much as Bob Gibson used to do, but in the second clip, his follow-through position seems very similar to Roy Oswalt's, even though Roy doesn't enter into his delivery with nearly as many moving parts as Tim.