[Danenania]

This seems fine except imo a river bet is much better than c/c. You'll be called by A-high quite often but almost never bluffed.

I think the primary mistake that BK and perhaps others are making is giving CO way too much credit after his flop donk. An unknown flop donker at 10/20 can have a huge range, including pairs of 5's, 4's, 76, 87, A2, A3, 66, 33/22 and even total air. Folding the flop would be a mistake.

The turn has some two-way bluffing equity because besides possibly making CO fold 88/99 there is also a decent chance of making button fold QQ/JJ/99/88 all of which fit pretty well in his range.