Naruto Shippuuden Episode 221-222

[LunaticCat]

Well, Madara said something like "where did you get that".
Oro tried to summon the 4th, so it shouldn't be so hard for Kabuto to summon him. If Madara knows about that (and I think Madara knows everything), he wouldn't be suprised to see him. First and Second have been sealed, so I don't think they will be ever ressurected again.

[Jessper]

Well, Madara said something like "where did you get that".
Oro tried to summon the 4th, so it shouldn't be so hard for Kabuto to summon him. If Madara knows about that (and I think Madara knows everything), he wouldn't be suprised to see him. First and Second have been sealed, so I don't think they will be ever ressurected again.

That's what Darth means. The fourth used (or I think we were lead to believe such) the same sealing technique on the Kyuubi, the cost for the technique is that you're sealed as well, when it is done. If that is the case, then either it can't be the fourth because he is sealed OR it could be the fourth, or the first, or the third etc etc. I don't think anyone was implying it IS the fourth, that would just be odd, I think.

Edit: I typed this all out then realized that you're right, Oro did try and resurrect the fourth didn't he? If that's the case then either he didn't use the same sealing technique or that doesn't prevent the resurrection technique. Or there was no foresight in this situation (likely).

Also, if he could resurrect the Sage of the Sixth Paths presumably he wouldn't need to make any deal with Madara, he could just kill everyone on his own.

[LunaticCat]

Edit: I typed this all out then realized that you're right, Oro did try and resurrect the fourth didn't he? If that's the case then either he didn't use the same sealing technique or that doesn't prevent the resurrection technique. Or there was no foresight in this situation (likely).

Ah, come to think of it: Oro did try to summon him - we don't know if it would have worked correct, maybe the coffin would have been empty... (But the truth is (for sure), that Kishimoto never has "foresight in this situation" ;-) )

Also, if he could resurrect the Sage of the Sixth Paths presumably he wouldn't need to make any deal with Madara, he could just kill everyone on his own.

you have a point