Ross is just 6 years into his career, even though progress has slowed down he's proven on different tracks that he can rap about different shyt.
Jeezy raps about the same shyt from different perspectives, he raps about the shyt that matters to him, that he relates to, that he understands and goes through. Ross is I wouldn't say fake but he manufactures a lot and I think he can "manufacture" any type of rap. Just like Lil Wayne showed that he could kill a joint like My Generation, or be one of the few rappers to outshine Andre on Hollywood Divorce and on.
But dropping a full "concept" album takes balls to maybe flop, to maybe drive your fans away or maybe it's just weak as fukk (like Rebirth).
I think Ross could do it, but he's not that type of rapper today and he's not in that mind state just yet, but the capabilities is there.