More correctly, I think, if the Reds trade Chapman someone like Revere just would not be the type of player they would be looking for, at all. They are in rebuild mode and they'd want a top prospect.
Chapman is still an asset vs. his salary, but if they trade him before the season then you also need to factor in the value of the QO compensation pick that he will almost certainly land a team next offseason. So Chapman could carry a lot of trade value this offseason, especially to teams that are high on the win curve. Chapman for a top hitting prospect in the #26-50 range, or a top pitching prospect in the #11-25 range, would probably be a fair deal.
So a fair deal on paper might be Pompey straight up for Chapman.