He's 2nd in the entire premier league for possession won, behind only Elliot Anderson. Ahead of Rice, Caicedo, Szoboszlai, Wharton,Gravenberch, Tonali etc.. and very far ahead of Casemiro.
Lies, damned lies, and statistics. Where are you getting that from?
I presume you are using crude and misleading total figures, which would be hugely skewed by the simple fact that Wolves' players have to defend much more than anyone else.
If you look at the more sensible 'Poss-Adjusted Tackles + Interceptions' measure, for instance, then he is 51st out of midfielders in the Premier League (only 47th percentile).
Behind "only" (in order from number 1 in the league down, min 880 minutes): Casemiro, João Palhinha, L. Cook, T. Adams, A. Onana, Andrey Santos, M. Caicedo, Nico González, T. Iroegbunam, V. Janelt, R. Bentancur, G. Xhaka, C. Baleba, B. Kamara, J. Garner, R. Gravenberch, D. Rice, P. Sarr, Rodri, E. Ampadu, A. Scott, L. Miley, Florentino, I. Sangaré, Bruno Fernandes, E. Anderson, A. Mac Allister, E. Le Fée, T. Souček, S. Longstaff, D. Gómez, Bernardo Silva, A. Stach, F. Potts, Y. Tielemans, Y. Yarmoliuk, S. Magassa, S. Berge, Joelinton, Mateus Fernandes, S. Tonali, Y. Ayari, I. Gueye, W. Hughes, J. Henderson, , J. Cullen, K. Mainoo, André, M. Munetsi, X. Simons.
Even if you look at raw, unadjusted per 90 tackles+interception numbers, he's behind Joao Palinha (6.61) , M. Caicedo (5.80), and F. Luis (5.71), T. Adams (4.21), and joint 5th on 3.94 with M. Fernandes and D. Gomez. The first 3 are way out in front. Joao Gomes' number is near enough the same as Casemiro (3.94 vs 3.73).
When you add in other defensive measures he continues to look less impressive.. 23rd for Clearances per 90. 14th for Blocks per 90.
When you throw all this together with the fact Wolves have to do so much defending as a team, he's only around 40th percentile for PL CMs at
'Threat Prevented'.
He's also top 10 CM in the league for progressive carries, dribbles etc
I don't know where you're getting this from either? Where I'm looking he's outside the top 10.
Also, dribble-first (as opposed to pass first) players aren't really what you want from someone you'd be principally signing hypothetically as a DM to keep games tight, as they vacate the space behind them.
He might overall be a tiny bit less limited than eg Ugarte, but that's a low bar. Overall he's still too limited, and I'd want more if United were only signing 2 or 3 midfielders in the summer.