[GLOW="]Yeah thats all it is to it and to never go blind of course[/Glow]We don't know too much about EMS but we know what when madara unlocked EMS he got new skills and become more powerful
I dont think you can lose the emsalso we dont know if madara still has the ems since he is only shown with it in flashbacks
well we just hear about what the ems does and never seen it in actual action. i think it coud be possible if madara actaully got a hold of rinnegan after leaving the village and gave to negatoI dont think you can lose the ems
we will just have to wait and see wat the ems does