HORDES is on the best way becoming my favourite tabletop, even though I had about 4 games in 5 years.

I'm currently getting back into it with the
Blindwater Congegration.
I have a few questions though and I couldn't find the answers in the rulebook.
1. If a Warbeast fails its Threshold check and frenzies I can remove all Fury points from it. But what happens if it succeeds? Do the Fury points stay on it, so that it's more dangerous to force them this round or are they still removed?
2. Usually the game ends when your Warlock dies. But what if I play a larger game with several Warlocks? If one dies, what happens to his Warbeasts? Do they frenzy? Do they leave?
3. Can a lesser Warlock like Wrong Eye and Rorsh have additional Warbeasts attached to his battlegroup?
Thanks is advance.