I think Guilherme's development has played second fiddle to the last managers desire to stay in his job!
Its the reason why Moyes didnt bring anyone through from youth over 4yrs.
You need the whole club to have a plan along with the manager of developing these youngsters.
Guilherme was worth up to 25m because he was part of a few players at Brazilian club
Palmeiras that included Endrick that went to Madrid, and I think Estavo who's still at the club. It's the type of transfer that Benfica or Porto would make and then that kid goes onto to Madrid or Milan.
We really need a system that develops players and not just "uses" them. I bet that we gave the example of Rice and how he became a 100m player under us as an incentive for players like Kudus and Guilherme. But that seems like a one off now.
To be the club we want to be, regularly in Europe etc.. you can't just buy ready made players. Even Madrid don't do that anymore. Why should we?
Maybe Potter's pedigree will change that. But way to early to be calling 18yr olds flops..being that they are you know... 18!