If anyone had any questions, they are solved.

[A Black Falcon]

There are multiple kinds of trolls, remember, DJ -- Forest Trolls in Azeroth, Jungle Trolls in the islands, and probably more kinds... Ice Trolls? They are widespread and diverse, more than just a offshoot race probably would be.

And the 'Medivh was somewhat posessed' thing isn't new here, it was in the WC3 backstory too, I believe...