This topic assumes that the rest of the continuum can't interfere, they don't count.
Are all the other omnipotent beings part of this fight? Kevin Uxbridge, for instance? If the other omnipotent beings count, I think they could outnumber Q.
Yes, it's literally every living being in Star Trek versus the main Q, with the other Q not willing or able to interfere. Even the tribbles are involved, though obviously they won't have any effect on the outcome.
Kevin Uxbridge was very powerful, but he wasn't omnipotent. If he were, then he could have dispatched of the Husnock quite easily, or transported his entire planet far from the warships, or made it invisible, etc. Why didn't he do these things?