No, Helios MK-II has place for placing gears so he can use it, but NV bakugan don't.
Still the rules say that Battle Gear may be opened up on card so as of right now, all Bakugan can use it. I am not 100% certain of Super Assaults being able to use it, but how can they allow special attacks to use it and not superassaults (like clawsaurus). Also you do not have to have the pegs to use Battle Gear. Snapzoid is a perfect example. He has no pegs BUT he has a Battle Gear Compatible sticker on his BakuBoost. If SpinMaster didn't allow B2, B3 or NV (NV)to use Battle Gear, it would CRUSH their collectors and collections so I think they will allow it. If they didn't, that would eliminate backwards compatibility with ALL prior Bakugan. Makes no sense.In fact, in the BakuBoost packages, all new paint NV Bakugan STILL have no pegs yet are shown in the packaging that says Battle Gear compatible. They can use the gear too, it will just have to drop on the gate card like a NV trap.And I think all B2 cards, B3 cards and GI are fine. If brawlers want to play an ALL GI CARD and ALL GI Bakugan Brawl, then that's cool too. HOUSE rules until I hear otherwise in Official Rules F.A.Q.
Collector types could care less about gameplay. It's the brawler types that would be worried. What about base set/vanilla/orginal bakugan (pre-NV) though?