You can def check the turn with AQ diamonds here. Great play by villain. The turn is a disaster. With two players still in the hand and not much room for improvement a check is probably the best play on the turn. The problem is, you don't have the nuts and you're not drawing to the nuts. The question you should be asking is, what are the villains coming with after the flop?... Most likely draws or trips...
The turn card is like having AA in NLH and the flop comes 10-J-Q vs 2 opp. You can jam all day, but most of the outcomes will be negative.
So, lovin the flop, hating the turn and the number of opp. The checks are traps, which are best set on the turn in PLO.
I like to be aggressive, so I would have probably fallen for the traps as well (unless I'm playing tight and/or know opp play). The mid-range connectors can win and lose a lot of money. Have to know your opp ranges and how they play to make a better decision. And have to be cautious of higher draws!
It def makes sense that an opp would have a higher flush draw. That means Ace-x for sure. Multiple players calling a raise preflop would suggest AQ combos are highly likely as well. That should make for an easier check-back on the turn.
Tough place to be. The good news is you look like a player that likes to jam without the nuts. That means you should get calls on some big bets later, if you play it right.
The key here is that you know both opp are capable of checking the nuts on the turn. That does wonders for their game because players will be more cautious on the turn, possibly giving them a free card in future play. Something to consider when having it on the turn/flop.