Not sure what short tourney run is, but none of that is deadly unless the play on Zach is really physical where grabbing, pushing and holding make it difficult to catch and/or he gets pushed way out. Not calling it tighter inside takes a lot out of the Purdue O.
The recent OSU game shows a bit what happens if the inside is cleaned up. Part of the 3 ball shooting is that the wrong players are shooting "some" and in a close game that can make a difference. I've harped on it many times before. What is a good shot for some is not a good shot for everyone. Also, I want to believe that after playing Purdue once teams have a feel on what they need to do the next time. The losses are all similar with all the things you state AND a few more. No doubt all the losses will be studied in the tourney.
Braden showed none of the IU guards could prevent him from getting to the rim, but the problem was TJD was there to clean up the drive. I suspect that if Brandon gets increasingly more minutes by rebounding and solid D without throwing the ball away that his shooting % goes up as he gets more comfortable with more minutes. Throw out any percent comparions between Ethan and Brandon, because Brandon is a much better shooter who doesn't get the same looks as Ethan most of the time. There needs to be more out of the 3 and a little more consistenly out of the 4 offensively. I think an improvement in the 3, increases the chances for an improvement in the 2. Still, I wish that Purdue got more out of the 4 as well...however it is done...driving the ball, shooting open shots that are "for THAT person" a decent chance of a make...can you say Gillis only...