If you buy young players with potential the idea is that they stay injury free and develop into better players as they mature , thereby contributing substantially to the team and becoming more valuable assets.
Over the course of 3 years the 4 I've mentioned have been far too often injured or unfit and even when they've played , have not developed beyond where they were when they arrived.
So to me that is 4 fails out of 4 in terms of what would have been hoped when signing them.
It doesn't mean they haven't been of occasional benefit to the team , but for a club which would regard £70m as big money , the return on investment has been poor.
Surely it's not too much to expect that one or two of them might have done a JoC (before bad luck crocked him) or an Ndiaye or even a Ramsdale.
All I am saying is that we need to be better at recruitment if we are fortunate enough to return to the PL.
Especially as there will likely be a huge turnover in the summer , promoted or not.