Honestly out of all of them perhaps Ice Cube might be the one who didn't make it without Dre.
Snoop dogg - He was destined for superstardom one of the most unique flows ever and personalities.
Eminem - Ditto.
50 cent - He was already major in hiphop and there was a bidding war for his contract so 50 didnt need Dre/interscope at all it was just the best decision.
Kendrick Lamar - Dre doesn't even support this young man. I think I heard K Dot dissed him about it too. K Dot is super successful without Dre.
Without Dre being a musical genius who spearheaded NWA, how many chances would have Ice Cube got? It takes opportunity to present the talent.
Snoop,Em,50 those three for sure would definitely get the opportunity to blow without Dre.