I agree as himself and de Hong could have formed the best midfield pairing in Europe in the coming years but I do rate Puig highly and I think his energy levels, aswell as his ability could take him far. Arthur was very inconsistent but I always thought he was held back under Valverde's system more than anything.
I think where he left a bad taste in the mouth of the club and fans alike is when he injured himself skiing. His attitude didn't always seem great either. But you still feel him leaving will turn out being a mistake.
Pedri is also a cracking young talent. Ansu, Pedri, Puig, Aleñá, Araújo, Trincao, possibly Todibo if he stays and doesn't go out on loan..there is actually a lot of quality young talent at the club right now.
This will be make or break for Dembélé this season, but he's a serious talent and could really be a big player for Barcelona if his legs weren't made of glass.
There is also this man as well of course, who is one of the players who the team needs to be built around:-