By far the biggest issue with this game is that once a member of your team leaves, allowing you to control his egg, you don't get any xp from the damage you deal with that egg. I can totally see why they would make it like this, as people would end up xp grinding. Sure this is unfortunate, but how are people xp grinding really going to hurt the game? The point is that us regular players shouldn't have to be punished for those players who would potentially xp grind.