WI: Krist Novoselic joins the Foo Fighters?

I remembering reading that Krist Novoselic (former bassist for Nirvana) considered joining Dave Grohl's new band after Kurt Cobain, but they both decided against it because they didn't want the Foos to be seen as Nirvana 2.0.

What if Krist cast aside these doubts and decided to join the Foo Fighters? How would this affect the new band and their sound?
 
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