Tielemans works hard, hes not a Pogba type at all defensively. We need a solid system in place of course, but he's just perfect for the all rounder role. We need a holding midfielder behind him, but the thing is, those 2 positions are needed anyway. Pogba is the most advanced midfielder of the 3, he's not worth it in the other 2. I wouldn't compare Peps tactics to anything we should build towards, only he can make a midfield of Gundogan-De Bruyne - David Silva look balanced. At most other clubs, Gundogan is a pure central midfielder, just like Tielemans.
He doesn't need to be a Ndombele, Ndidi, crazy hard working box to box type. In fact you mention Van de Beek. He plays as an attacking midfielder basically. Hes really hard working, but he plays essentially in Pogbas position. They play De Jong as the holding mid and Lasse Schone next to him most of the time to provide the midfield balance in the middle. Tielemans is that midfielder to provide balance and link it all together. You get a workhorse type of midfielder and we'll again be in a situation where we lack that midfielder to dictate games with ability, because on the ball ability and intelligence is what we've lacked in our midfield for years.
That was going to be Gundogan's role eventually because he lacks the mobility these days and often obstruct City's flow in the midfield whenever he plays as a no 8. If he could adapt into a central midfield role from his previous no 10 role at Nuremberg, I don't see why he can't adapt further into a no 6. Moreover, Silva, Bernardo and de bruyne have high workrate to help him from being constantly exposed.
Van De Beek is at his best as a central midfielder either as a no 6 or no 8. That was where he mostly played last season and in Ajax academy where he got cruyff award. He was moved to the no 10 role to accommodate Frenkie and Schone. Last year, Frenkie was either injured or played in central defence but with the signing of Blind into the defence this season, the coach had to find Frenkie a new position and also, they needed to replace Klassen hence the reason Van De Beek had to be moved to the no 10 role, considering his noses for goal and quality movement and that makes him better fit for the no 10 role than Frenkie. (Tadic replaced Kluivert in the team)
Personally, I would have Van De Beek as a no 6 if he were to come here because that was the role where he impressed me against us after coming on for Schone in the Europa final match. He's also mobile, good in the air, can switch play and is defensively solid.
I actually would like us to have a 3-man central midfield of Tonali, van de Beek and Ceballos, with Van de Beek as the no 6 at the base behind Tonali and Ceballos. Tonali is a better dribber than Van de Beek and also he's got terrific throughballs when close to the opposition's box. Ceballos is more like a pass and move midfielder with a high pressing skill.
Against top opposition, Ceballos could give way for MCTominay. A midfield of Van de Beek, Tonali and Ceballos could even work against top opposition side as long as they all work in tandem with one another and contribute their defensive quotas which they are all capable of.
I want high workrate midfielders who are all defensively sound and mobile which is what Tielesman isn't. I wouldn't mind him as a squad player but he wouldn't want that.