Re: A9o slightly tricky scenario.
I would often 3-bet PF but calling's cool. I think checkraising the flop is far better than leading out. If you plan to lead the turn I see no reason not to 3-bet the flop.
As for your questions, I'm calling down in either scenario by default. I might bet/fold the river if it gets HU with button, if I trust him.
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