Leo will be helping out. However, he's going full demonic Sunai mode since it seems like their backs are against the wall here. (points to icon). So the longer he's in that state, the more he's likely to lose control, and attack those also defending instead of just the Null, where he can take souls with only a touch, providing a hindrance there. The only way to stop him is going to be a fatal attack like shooting him in the heart or head, so if anyone wants to go that route, plot with me!