On Aarons, he is a £20m player.
I would place him on par with Wan-Bissaka who went to Man United for £45m pre-covid!
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He has very similar stats but he has less Premier League experience. I am not saying they are like for like but he has huge potential and he is also 2 years younger.
Aarons is a potential a 10 year signing similar to Baines and Jagelka. An outlay of £30m might seem a lot but long term it's a bargain.
Please, please don't just rely on stats to determine the value of a player.