I hate to say it, but if there was a consensus BPA at #9 this year, it was probably Mitchell. As I tried to make clear in my previous post, you are confusing two ideas: 1) Taking a bad player who you think will be good a player and 2) Taking who you think is the best player when he contributes to a positional logjam. #1 is always a bad outcome, regardless of whether there is a positional logjam or not. #2 is almost always a good outcome as long as the player you think is the best player turns out to be close to the best player.
My draft would probably have been Jalen Johnson given the players available at #9 (and I would have been tempted by Isaiah Todd, particularly if he had better draft stock). Once Wagner went off the board, I probably would haave tried to trade down for something like OKC's 16+18, where both of those players would have been available, as well as Sengun. But I'm not GM. And if Monte thought that Davion was the clear BPA, that's who he should pick, regardless of fit. That's what I assume happened.
Davion was in no way a reach - he was being mocked as high as #7. If the major consequence of the logjam is that we had to send off an OK backup PG for a backup center, that's really not a huge deal.