Very attractive from a PSR point of view getting someone in on a free like what we did with Kamara and Tielemans. So I'd say Sancho will knock a very decent contract out of his next gig in the summer.
Since it's SCR rather than PSR from next season, it may just down to which is lower:
a) the annual cost of his wage with amortisation of a big signing bonus?, or
b) an equivalent player with a lower wage but annual amortisation of a big purchase fee
I suspect the difference is less than we'd assume when we see 'on a free', particularly as agents fees are included in calculations towards SCR.