Maybe, I don’t know. Perhaps he is in the top 10. In no particular order, the ones I think are better are: Cullen (Burnley), Ampadu (Leeds), Tanaka (Leeds), Sheaf (Coventry), Vinicius Souza (Sheffield United), Morris (Boro), Neil (Sunderland), Grimes (Coventry) and Charles (Sheffield Wednesday, on loan from Southampton).
Alzate’s better than some of them at certain things. For example, he’s better on the ball than Vinicius Souza. However, I do think those aforementioned players are better number 6s overall.
I still maintain that Alzate is probably a better number 8 than he is a number 6 but he’s playing there out of necessity because he’s the best defensive midfielder we have and we already have lots of number 8s.