[crashwhips]

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Yeah I really like a lead here, it puts most marginal hands in both positions react more strongly than if the CO standardly c-bets.

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And what do you do if you lead and the CO raises? (I assume you'd fold if the button raises as since he's passive he probably has a set if he raises). The CO is aggressive, so he's definitely raising a set of tens, top two with a redraw, and KKxx or AAxx with diamonds, probably raising combo draws (some of which you are doing very well against, some not so much), and maybe raising dry wraps or top two. You're in good shape against many of those hands so it'd be a tough laydown to make.

I think you probably have to play for stacks in that case, which is why I prefer a check raise, as you still play for stacks against CO when he wants to, but additionally you can get a c-bet out of CO when he's weak, trap the button's money in if he just calls, and charge either player more money/force them to fold if they have a wrap or a higher flush draw.