Originally Posted by Katon707
i said soooooooo long ago that the peircings were a major part of pains ability as not only do the bodies have them, but also every summon that animal realm pain summoned had them. they are most definately used to channel chakra through the other bodies as maybe only nagatos chakra can use the rinnegan, so all pain and pain linked bodies would havto channel nagatos chakra through them somehow so they could use the rinnegan.
exactly. these peircings channel nagato's chakra. You must've noticed that each pain controls only one ability, and so far no one have the ability to raise the dead body of another. So what causes these bodies to live again? Surely nagato cannot show himself in only 10 seconds to ressurect 3 bodies.
Think of a rechargable battery, and connect it to a dead body pain uses. At first, the battery has no power inside it, and in order for it to work, you must plug it in a charger. The energy stays inside it until such time that it drains out.
If you look into it clearly, you will notice that those peircings look like plugs, and those channel rin'negan's chakra into them. For a pain to ressurect, he must either have:
1. his life chakra, which comes in the rin'negan, shared from another pain body, or
2.have his body recharged in the hideout.
And if you wonder what those "chargers" are, they are these coffin-like capsules in http://www.onemanga.com/Naruto/369/16-17/
nagato channels his rin'negan and life chakra and rin'negan to those machines, into the bodies of those lifeless bodies, through those peircings.