It’s more important that you have an actual good team than it is you have strength in depth if you want to win the league. If, when you field your best XI, they are not that good/balanced anyway - then chances are you will win nothing, unless you actually het lucky by having injuries which force you to fond balance. Nobody is suggesting playing Lingard or Pereira if Sancho were injured. Not sure why you would mention them instead of Greenwood and James.
I’d like us to have depth in the middle too, which I suspect the likes of McTominay/Fred will contribute to. I think we should sign additional cover, and get rid of the two jokers we currently have, but I also don’t think we should change our team every game, and I think Havertz at 100m is not the cover you buy. We’d be far better off buying a different type of midfielder if you want to throw that kind of money around, rather than tripling down on another replica of the two best midfielders you already have in the first place, while having a huge disparity in quality to your other type of midfielders.
I have nothing against Havertz, I’m a fan. If Pogba were to leave, I’d be all for it. But there are already question marks as to whether we sh be playing Bruno and Pogba together as it is, let alone adding another one. Why not go and spend 100m on Saúl or someone of a different profile who will compliment them? Or Camavinga perhaps?
I’d take Havertz as a greedy fan. I’d take Havertz and then take Odegaard the following week because I like them. I’d have no issue with us buying him, but it doesn’t make sense to me unless Pogba is leaving within the next 12 months. Personally, if he joined, I’d expect Bruno to be on the bench anyway, not Pogba - as Pogba is the one of the three that Ole will likely play in his double pivot, and I’d expect Havertz to prove to be a better 10 than Bruno.