[ QUOTE ]
Why should we donk the flop?

[/ QUOTE ]

bet the flop (sorry - but I never liked the term "donk") to represent an ace. force the option of folding upon him, and do so cheaply because we're OOP with a very marginal hand. Without an ace, there are still many reasonable hands with which villain calls a flop bet and folds to a turn bet UI, including a bigger jack...