No, it's not on BU. He can clipboard and coach how to break pressure in his sleep. They can practice each and every situation ad nauseum. There is no simulating game pressure, there is no simulating crowd noise, there's no simulating momentum, etc. and on the road, getting discombobulated under that pressure, is between the ears.
Handling pressure is on the guards. Don't run to a corner, don't try and dribble through pressure, yada, yada, yada. Basketball 101. Our guys(especially the Juniors and Seniors) know this and I'm sure BU has belabored the point.
BU is a cream of the crop head coach, but ultimately the players play.
Now, what does lie on BU is game management and having the right mix of guys out there. I don't like the thought of Plummer or DFW putting the ball on the deck. There's not a lot of options outside of TF, with AC being out.