I don't know the first thing about propping, but I think there are still some question-marks about Crockett's scrummaging at the top level. Rightly or wrongly he still gets penalised quite a lot at scrum time; he was penalised a few times vs Australia, and was the most penalised NZ prop during Super Rugby (being penalised 20 times). Though he isn't normally exposed at Super Rugby level, there is really a question mark as to how he will go against international props who scrummage differently, with international refs who interpret the scrum differently. Like you personally I would pick Crockett as he has been outstanding this year (and Woodcock has been average, at best, for about the last 12 months), but I've heard a number of ex-AB's props who aren't convinced of his scrummaging at the top level. Craig Dowd is one who make a lot of sense when he talks; he like Crockett was a very tall prop, so knows the difficulties that tall props can have.
Boric had a great EOYT with the AB's last year, and was in my opinion the form New Zealand lock in Super Rugby - while he hasn't showed any form recently due to injury, he has been in great form this year, so deserves his spot. Like you, I think Williams has been poor (lineout work aside). The problem is that there is not really anyone showing great form to replace him. Hoeata is completely unproven at test level, and has a habit of getting penalised quite a bit. Having watched probably every Otago/Highlanders game this year I can say that Donnelly isn't the answer - I don't know what has happened to him, but he has been very poor this year. He's basically been the same as Ali Williams - great at the lineout, but his handling has been shocking, and he hasn't added anything else around the park. Josh Bekhuis is actually the Highlnders lock that I would have preferred to see involved, but it is far too late for that now. Not sure what Chris Jack is doing (he's not playing ITM Cup as far as I'm aware)?
Incidentally, listening to the AB's coaches it sounds like it wasn't Zac Guildford, but rather Israel Dagg that took Hosea Gear spot....