He’s a completely different player to Matic, he’s capable of very good defensive actions across the midfield but he’s not a holder/anchorman (Makalele) nor is he only a defensive energizer bunny like Kante. He’s more of an all-rounder, a little bit like Camavinga but more defensively-inclined, whereas Camavinga in my view is a better dribbler in the midfield. (Disclaimer: not saying he’s as good as Camavinga, only comparing their styles of play)
In a hypothetical scenario where he comes and is a starter faster than expected, I would still want us to get a DM in the mould of Zakaria/Kalvin Phillips to play alongside him.