I think the devs weren't ready to fully commit to werebears just yet, and just wanna do it right, and in the mean time gave us summonable werebears and enemy ones, maybe for a future dlc. If this is true, it's for the best so werebears don't feel tacked on. Meaning maybe they'll get a faction and new lore.
If they're never put in, then I guess it was a sort of easter egg joke type thing.