Do you think asamoah is better suited for LWB or CM?
Waste != bad
Using chiellini as left back is a waste. Using messi as a left winger is a waste, although he might do a great job and even made it to team of the year in laliga but its still a waste of his potential.
Asamoah did a pretty decent job as LWB in the past 2 seasons, but he is still far from the word "excellent"
Look, its very simple
Every attacking midfielder is "a cam" when they are young, and they all want to play in the center. Few prefer the flank. However, some just got qualities that make coaches put them there. Especially looking at a formation.
Our central midfield is Vidal, Pirlo, Pogba. Asamoah is a good cm, but not that good. He doesnt excell in any area for a central midfielder, where as Pogba Vidal and Pirlo each excell in certain area's, wich becomes every area when combining it.
Asamoah got great qualities to be a defensive winger, and basically win the duels for the flank. There is a reason he's highly praised by analysts. Asamoah isnt good enough to be a starter with a top team in the centre. But he is when you want a robust wide midfielder to lock the opponent down, and muscle the play forward whilst giving no quarters in organisation.
Chiellini as a left back is not a waste. Because pure defensively, he's top3 in the world in that position when he plays a few games. offensively he's not that good, but he can take alot of work off an offensive left winger, because of all that defensive solidity behind him.
Messi on the left wing would be a waste because he cant put inside, but against excellent defences, "inside right winger" is his best position.
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Vidal is also the best CM in the world while Isco is struggling to get playing time in Madrid (especially now with Kroos and James). Isco + 60-70M = Vidal (and thats still to little IMO), anything lower than that and i wouldnt even talk with them.
The equivalent of Vidal, is probably Kroos himself.
With the key difference that Kroos doesnt carry a team(yet).