You're killing me. I'm explaining to you drills and technique and you are posting videos of a different sport. I guess linebackers all across America are doing it all wrong. They should be hopping around and learning from the Red Sox second baseman. Imagine how good Sean Lee will be when he reads this thread and corrects his technique.
LOL... you are funny, and feisty! I posted that because in your response to my first post you mentioned that you were sure he was hopping during the pitch got to the batter not as it was getting there. I was just pointing out that your suggestion was incorrect. I originally talked about baseball players and tennis players doing this very thing so that they could react instantly to the direction of the shot/hit. It does not in any way slow you down, but instead it helps you "load" and explode.
The reasons it isn't ideal in football is that:
1- the snap is varied so it is harder to "time" than something like a pitch or a serve.
2- plays are slower developing than a hit ball so there is more reading then reacting as opposed to pure reaction.
Finally, for the reasons I just mentioned, most players are already moving their feet when they explode which does exactly what that video depicts. It helps them "load" their weight and explode.
No need to get upset, my point originally is that a "hop" is not indicative of a player being out of balance as you originally stated. It is instead a way of loading, and in a drill like he is running it is perfectly acceptable.