[cmwck]

I would forget about protection and just bet the flop.
You have a huge equity edge against 5 players, so get your money in there.

If you check, it may get checked through. Someone in late position may bet as well. But, if someone has A9 and it gets checked to them, theyd probably bet, so you have no hope of folding that hand on the flop. A hand like A6 would probably not fold either, as theyd be getting 8:1 even facing two cold.

I would check the turn. You dont know youll get three callers to make this a good value bet. If MP1 bets and gets two callers, you can consider raising the turn for value.

Do you think Ace-high is good 5% of the time on the river?
What do you think two different people were raising you with?