FWIW, I agree with a lot of the OP. But looking at it from a macro point I think to answer "where it all went wrong" you have to look at factors well beyond this season:
- The Bernie Fine scandal costing us our only big man coach. I have no idea how good of a coach he was but we have had a run of MCD AA big men with all of the talent in the world who haven't improved one iota in their 4 years here.
- The day JB decided his schtick was the 2-3 zone and that's it and started recruiting long and rangy fast twitch explosive "athletes" for the zone rather than basketball players... you know guys who can actually put the ball in the hoop. It's inexcusable in this day an age that a top 5 program like ours which selects players only has ONE guy who can shoot. We haven't recruited a good scorer since Dion... and before that it was Devo, Flynn and Green. I personally blame this on the ill fated dynasty era which cause JB to go all in on the D. He stopped wanting to deal with the egos that tend to come with really skilled scorers.
- The day GMAC and Melo won us a title... That season convinced JB to move away from ball-movement and more to a craptastic combo of one on one scoring and screens to free up a shooter. Well guess what when you don't have Melo (or Dion) and you don't have GMAC our offense stinks. There is zero ball movement, zero creativity, zero anything beyond run off of turnovers or long misses the zone causes. Another guess what... if you can't rebound on D or if your point guard stinks in the open floor you are not going to do much in transition.
- The day 30 or 40 years ago JB decided it wasn't worth his time to develop a bench and that "with all these timeouts, kids don't need a rest and can play all day"... this I believe has been JB's #1 weakness in his storied hall of fame career.
I think all of the macro factors have resulted in this perfect storm which has caused us to have a pretty non-satisfying stretch run. Having said all that that, if Cooney gets hot, we are going to make the final four... such is the state of college basketball this year. I applaud the heart of this team in going 25-0 which is an amazing feat given the limits of this team.