I do think the practice routine is partly to blame. It's a physical game and physical practices seem like a must.I wonder a few things:
1) is it because they’re okay are the smallest team in the league?
2)is it due to poor training?
3)is it partially due to weather differences? (When you’re used to warmer weather, you could be more tense when playing in the cold, than someone who’s used to the colder weather. Making it easier to get injured.)
4) is it a combination of all of these things?
What changes can be made?
I never considered the weather to be a factor, and I'm not sure if Miami is smaller than most teams.
Of course, Grier has also taken more chances on players with prior injuries including Tua, Phillips, Chubb etc.