I'm opinionated on the subject of Sepultura but it's true to a large degree. Seps always was Max and Igor, they came up with the band and came up with the name, AK was hired help. Maybe the brothers shouldn't have left to pursue other things like they did but AK only got it through legal channels and for the most part since the brothers left, Seps haven't played decent trash, they've played shit.
People like AK shit me. There is a band getting around the US now named The Little River Band playing music written by the original LRB in the 60's and 70's. None of them are original players, none of them wrote the songs but thanks to a fucked up judge the original members of what was once a classic Aussie rock and roll band aren't even allowed to market themselves with the name they came up with 40+ years ago. The LRB website is even geo-blocked from Aussie IP addresses because the band hate the fact that Aussie fans don't like them and they got booed off stage last time they toured here.
Too many bands lost what belongs to them because of a fucked up legal system, even if I didn't like early Seps stuff I'd still be pissed off with such bullshit. It would be like Exodus telling Gary he's no longer part of the band and then some fuckwit judge telling Gary he no longer had the right to play the music he wrote. It's unlikely but it could easily happen if the band pushed for it because of the way the legal systems work.