Main reason I don't like FCP is because it tires my players faster which leads me to believe I'll face greater risk of injury.
There is nothing in the rules or that I have read in posts from BBs that would back this up. In fact, my own experience suggests that getting injured has nothing to do with how tired a player is.
I prefer to drop my players back into some sort of zone so they aren't running around constantly, instead protecting an area. Keeps them fresher and considering I have a strong defense
The only defensive tactic that makes your players tire faster is FCP.
Run of the Mill Canadian Manager