I think it's inevitable that he'll be back, I just hope he stays gone for 3 or 4 years. But if he's not back in time for #100 I'll be damn surprised.
I think it would be cool if he came back in time for the end of the Pantheon story... and having realized how much Kitsune manipulated him over the centuries, sided with the turtles against her. Finish up the redemption arc hinted at in #50. That's a Shredder story we haven't seen done before.
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