Pity Martinez was a Casualty under Frank De Boer's System. If Tata stayed or we got Belisa to replace him, Pity and Josef would have been a Destructive Force that'll put the League on Notice.
This list is specifically players who cost the most to buy from another club, not their salary. Messi joined on a free transfer, but is being paid tons of money through sponsorships, Apple TV, jersey sales, etc.