2-3 Zone offense is not Cal's strong suit. Before I give my opinion, let me say it's based upon playing at the college level as well as multiple years coaching (two at college level under a HOF'er) at college and varsity HS levels. With that out of the way, the CATS zone offense is perplexing at best, awful at worst. It incorporates none or very little of the following good zone offense fundamentals:
*Flare screens on outside of top zone defenders that can lead to . . . .
*Skip passes that will make the bottom defenders help while top defender fights the flare screen which leads to . . .
*the ball side box area/ short corner now being open which leads to the low middle defender and low back side defender having to choose between covering the middle and the ball side box which would then leave the help-side baseline open for
possible lobs. What I've just describe can be accomplished with two passes and can be achieved with the three out two in (high low preferred) set.
This is a staple in zone offenses. Other zone offense fundamentals that you never/rarely see out of the Cats: Overloads, shooters running the baseline, absolutely nothing that stresses the bottom three defenders of the zone. Instead, KY chooses to consistently screen the inside of one of the top defenders and trying to get the top guard into the middle around the FT line. The only problem is that when the guard gets there, the middle low defender easily picks it up and the two low block defenders can still easily cover UK's two bigs that are hanging around the block. When they do flash one of the bigs to the middle, nothing else is happening to stretch the zone - like flares, skip passes, and overloads.
UK's zone offense is a hot mess and it's maddening to watch. Luckily, they are just so damn talented while playing enough good defense themselves that they are able to overcome it. I love what Cal has done and he has infinitely more BB knowledge than myself (I've been out of the game for over decade and am just a casual observer), but jeez, the zone offense is inexcusable.