I think Jiraiya will help point out the obvious to Tsunade - Even if she does decide to heal his arms (if she can) he will not give her what she thinks she's gonna get. He has to have sacrificed bodies to do the revival for one, and well, herself and Shizune are there for the opportune moment heh. I doubt she does it.

~Chris
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"I will hack into your brain and type Format C:!!"