Grey spent some time with the Faction Leader, but left soon after. He still wanted to continue his training since there was still bits of essence left from the treasure he took from the Second Prince. The biggest gain in their mission wasn't killing off the Princes or leveling the Capital, rather, it was this treasure. The group has been able to grow by leaps and bounds just because of this treasure. Grey's already in the Fifth stage of the Sovereign Plane, yet he could still feel some leftover essence from his share of the treasure.