Holy shit. You're seriously not comparing Kendrick Lamar to Drake are ya?
Kendrick's ability meets the criteria, he has the top quality that makes him one of the BEST. You may be laughing about the fact that I said he is one of the best, but he has the It factor.
Drake's ability at rapping is average. But like you said, he's more known for his flow. But is he a lyricist? No. Thus, Lamar crushes his music into little pieces.
Dont believe me? Go and listen to HiiPower, The City, and his rapping verse in I'm on 2.0.