Question?

Is the following statement true?

It there more epics then uncommon monsters in the game?
(including all the variants)

epics > uncommons > rares > commons.

So what makes them epic if they are more are more common they any other mobs

I would venture it is based on catchability, not number of mobs in said group.

Stats in general are higher on Epics too. Everyone could be common. but an epic is bigger than that.

I would venture it is based on catchability, not number of mobs in said group.

Completely on target. It is based on catchability and how often you encounter it in the wild.