As far J. Cole and Buzz is concerned,
I am slightly concerned. I don't think at this point he will suffer from a lack a buzz, especially once his album campaign/rollout comes in full swing.
However, in this musical climate he is playing with fire. He basically hasn't dropped anything since the album with the exception of a few records. Drake has done the same thing not dropping anything individually since Take Care. However, unlike cole, he's on a lotttt of record that get spins on the radio daily, allowing his buzz to stay at a peak.
Cole doesn't do a lot of "impact" features, therefore its almost as if he doesn't do any. Combine that no individual tracks, you can see why there are concerns with his buzz. He's clearly not as big of a name as he was when Sideline Story came out. That'll probably change once the campaign gets into full swing, but as of right now he isn't. He won't flop or anything, but he probably won't get near the amount of records that he sold off the debut.
In a climate where frequency is of the highest value, he leaves a lot to be desired. Hell, he doesn't even do any social media
I'm sure there's a method behind all the quietness, hopefully its a method that doesn't bite him in the butt once he decides to be active again.