Kurt was a dick
Kurt is a jerk, no wonder Dave dont talk about the prick.
Once they got famous Kurt got new contracts made then threatened to leave the band unless Dave Grohl and Krist Novoselic signed. Before they split thing evenly, but afterwards their shares down from 30 to 12.5%.. But it was a retroactive contract on previously released albums, and they could only collect revenue from a total of 11 songs. Less than 4% of overall royalties from sales and Kurt got the rest.
I believe Dave and Krist still have/had equal voting shares for the company, not sure on current owner.