I have been thinking about this ability granted to the rinnegan user and I am wondering if it could be considered a Space Time Technique. I know that in the Wiki it states that is is a sealing technique but that is where I am thinking it could be considered Space Time related. The amount that gets absorbed from what we have seen from the manga is that it can seal a huge amount of chakra. It has to go somewhere it cannot just vanish into thin air energy cannot be destroyed it is transfered. The body of the rinnegan user would be the transfer point between the space where the energy(chakra) and the seal itself. It sound very similiar to Obito's Kamui. After reading the explation of Obito's Kamui I have been wondering about the similiarites of Blocking Technique Absorption Seal. They both transfer energy from one point to another through the body and a separate space. Yes it is a seal, but it still could be considered a seperate space. If this is true it could be why Obito is standing his own ground and being in control instead of Madara in the current situation. If he can control both Techniques efficently he can have and unlimited amount of chakra just by simply using one technique over the other to maintain his stamina and refuel his chakra that he may have lost from using Kamui. If this is all true then even Edo Madara can not defeat Obito. It a weird thought but its something I have been thinking about for awhile now. Does anybody else think that this could be a possibility?