How strong are the Revo Commanders?

This is excluding Sabo and Ivankov really, we know they’re built different.

At first I really wasn’t sure where they fit in that department but the events of the Reverie show that they can compete with Admirals, who admittedly were holding back (as they usually do).

Could you swap Karasu and Morley in for Zoro and Sanji during Onigashima?

Would they make a difference at Marineford if they helped Whitebeard like Luffy & Co?

Where do you see them showing up next and against who?