I'm sorry but Yoro was signed as a starter, no team sheds out £50m+ on a youngster who may not make it. It literally makes zero sense to spend that on potential, that's finished article material, most starting centre backs for any top CB isn't costing much more.
Heaven was the potential, hence why Utd snapped him up as he was out of contract, the lad they've just bought from Spurs is potential at £4m plus add ons. The young CB Nelson from Leicester who is 22 is potential but he's valued around £10m, that's what you spend on potential.