Draft and Develop is a general approach, not an absolute. Also, Best Player Available is actually a myth. TT doesn't draft BPA, otherwise he would never trade but simply take the next guy on his Big Board. There's more to it than that. You look at whether the player up next fits the pick value or not, also, you look to see if he fits your system and, believe it or not, your need. Any of the these factors not matching can trigger a trade. Also, if you have a guy rated a 97 at a position you are doing well in for the long haul, you take the guy rated at 95 for the position you desperately need.
Also, the concept we don't get involved in FA is pretty much a myth as well. We just do it judiciously and not nearly as frequently as other teams but we are involved. TT just doesn't go stupid with the money just because the fans want him to. He has a lot more data that he has to account for, not just short term but long term as well. Could he tweak it a bit in my opinion, sure. But it's hard to argue the results of last Saturday, given we ended up without our top 4 receivers and still should have won the game.