if sasuke had a kid with karin, that would mean the kid would be op

[Fanta]

It's related, but it's not Senju and not close enough to Senju.

do you have proof?

 

[Disquiet]

An Uzumaki-Uchiha hybrid cannot awaken Rinnegan the way a Senju-Uchiha hybrid presumably can.

I never said one could. I was addressing the question whether it can act as a substitute or not. Considering that one might have to go through the MS>EMS>RINNEGAN, it would be unlikely anyway since he would have to kill a brother. If not though, it's not too farfetched too assume the possibility. Considering, that Madara said "You can't unlock the rinnegan without senju and uchih DNA. And you can't control it properly.

Spoiler

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Nagato did just fine. Thus putting a huge hole in this conception.