A question about Nexus Blitz

So I've been testing/playing Nexus Blitz on PBE for the whole week so far & I can honestly say that Nexus Blitz is going to be an extremely popular game type if it becomes permanent.

One question I do have is how come Ivern is disabled on Nexus Blitz? Was his passive creating issues with the Monsters AI or the Buffs (since he can share buffs & the buffs can be shared between junglers on NB without Ivern).

Can't have a party without the Tree-Man.

[zombie-nunu-bummed]