Tobi can't be dead because his abilities and background were not shown.
Tobi can not be Obito because Obito is dead.
Sasuke himself never said he ran out of chakra; Deidara assumed Sasuke ran out of chakra.
Pain or Pein, the Akasuki leader, could be related to Naruto or Yondaime. It would be crazy if he was related to them.
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for some reason i dont think the guy with the piercings is the the leader. because he looks like he's under mind control. well actaully pain could be related because during the arc that explained how kekkashi got his sharingan eye it hinted the fourth wasnt born in the leaf village. and like i said mind control i have a feeling the girl next to him is controling him
It was definitely not mind control. His headband is crossed out indicating he's a bad guy.
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I think the "Space" jutsu that was mentioned was simply just Sasuke summoning Manda and then unsummoning manda at the same time to go to manda's world. Since manda took the blast and was under influence he couldn't fight sasuke back. All sasuke had to do then was to wait to be summoned.....
That's probably what happened because Manda did say Sasuke used him.
The serpent on the scroll disappeared which indicated "water boy" to use the summoning jutsu. Sasuke's blood was most likely in that capsule he used to pour on the scroll.