Yea, Berrio has no chin at all. Porras who has not much power KO's back in the day.
Miranda has proven he has a chin and a bigger heart. Pavlik had to almost murder him to get the stoppage, and that was against a Miranda that was not himself.

I just don't see the advantage of Edison fighting Pascal right now unless it was for a vacant belt or at least an elimination bout. Otherwise, Pascal has much more to gain than Edison.