Thanos and Darkseid
Thanos and Darkseid want to take over earth.
Win by KO, bfr, or death.
Movie/anime/magna feats allowed for Z fighters.
Kid Buu never busted a galaxy. He destroyed one by systematically destroying every planet over the course of years. Thanos knocked a multi-galaxy busting cosmic on his ass.
Kid Buu did so over a period of years, systematically destroying world after world. Brolly did it it one shot in an under-powered state. No matter how you look at it those stated here are not galaxy-busters, and wouldn't matter if they were since Thanos is the Avatar of Death.
" True, though there's no denying that Broly destroyed the South Galaxy momentarily before battling the z fighters. Broly is a multi star buster and at my belief destroyed the galaxy just by destroying it by destroying every star and planet. "You mean some/most of South Galaxy because that's where the entire movie took place, a planet in the South Galaxy
I'd agree with the sentiment of Thanos soloing, theres nothing the team can do to him and theres plenty he can do to them.
There is absolutely nothing on planet Z word Darkseid's or Thanos' attention, unless the plot dragon has the Anti-Life equation this I don't see the motivation as plausible.