Maybe I didn't make my point clearly enough. It's fine to say that McTominay and Bruno are top 4 midfielders (jury's very much still out on Fred and vdB). But when McTominay plays deep his pass progression is really poor. I don't think fred can play 6 as his game is no8 - get around the pitch shutting down passing options. In that group (vdB, McTominay, fred - bruno is a no10 and his position is just different) we have no-one who can do what Pogba does - reliably create chances and beat players from deep.
There would be a massive gap between our defence and attack, as we wouldn't have anyone who is good at moving the ball quickly forward. We could have an attack of Ronaldo, Rashford, Greenwood and Bruno all standing at the half-way line all game cos we have no-one who could get the ball to them. Buying a no6 will not solve that, unless we find a previously unknown god-level cdm.
I think you're massively underestimating how important Pogba is for us as an attacking force. From cm/am he has been majorly involved in pretty much all of our goals so far this season - you can't downplay that.