Oxy was successful and Q had two big records on there, three if you include the feature he did with Tinashe. I'd call that a success, even though I still think the album was ehhh.
Flab Soul...that's an L. Seems pretty obviously why TDE didn't want to release it when it came out.
Rashad...came out of virtually nowhere and sold more than 10k records (nearly as much as Flab Soul), I'd call that a win. Dude has potential.
SZA...meh. I like her project but I just don't believe she'll be some big star or is meant to be. She's a great songwriter to have though. And unlike Jhene Aiko she can actually sing.
I think Kendrick will at least go gold regardless of what happens. The question is whether this album will last longer than that, get close to platinum, be acclaimed, etc. I don't see it matching GKMC critically, that would be nigh impossible. But he can have a very successful album that makes people stop talking about GKMC. He toured off that album for two years...which is nothing compared to other genres back in the day, but it's pretty noteworthy in 2012-2014.