Not for sure but wouldnt you do the same thing if you where a coach. You have 4 guys competing for a job. You want all to get better so you tell them no one is standing out. This pushes them to try to excell and therefore the group, as a whole, gets better. If you name one guy then the other 3 slack off because they know they arent in the race. Competition makes everyone better. Though you have got to know that he has someone in mind. Notice how he doesnt even really mention Joe T in that article and Cox as a side note to what he says about Stafford. I could be reading into it a little much but, hey I have my opinions.
p.s. think we could get a few more injuries before the season starts? We are always losing somebody before the season starts.