[The Funky Llama]

I'm not trying to say that a fold isn't correct, just that folding in spots like this seems much more exploitable than only checkraising good hands on this flop.

I mean the guy is gonna see you fold the river and remember it for sure. It would take a long time before someone realizes that you only checkraise that flop with good hands. Furthermore, if they do start exploiting you and start folding to your flop checkraises (or turn followup), you can just start raising total air there.

EDIT: oh, if you're saying that hero should only fold on a 7 or 4 then yea, thats probably not exploitable. Didn't realize that is what you were saying.