LMK if you need an escrow. I'll do this one for free.
Will do.
If he's a scammer, he'll never take me up on the offer.
If he's legit, he's going to have a hard time finding a better offer than mine.
Has it occurred to you that these were coins scammed from other people? They're now being laundered, so of course he wants the deal to go through. You're not getting scammed directly, but you are a part of his scheme to get clean money.
Whether or not you care about the BTC originating from illicit activity is another matter.