Suigetsu's move is useless against Lightning release, so Kabuto can't fall back on that. This would allow Might Guy to get off some good hits, which is definitely fun. Plus they could Kamui him away. And I'd argue that Hiradora is a massive issue. If it could destroy Madara's Susanoo, it's definitely a threat to Kabuto. As long as they aren't in Kabuto's area, a lot of his moves are useless. Kabuto is strong, don't get it twisted. But the Eternal Rivals take his fight.