Personally, i'd go all in on Sancho. His numbers so far are incredible and are pretty similar to Dembele back in 16-17. He's only 18 years old and yet see the below:
Sancho this season from players in Europe's top 5 leagues:
Number of Assists:
Kimmich, Hazard and Messi top on 10
Sancho Ranked join 4th on 9 assists along with (Sane, Eriksen, Sterlin, Fraser)
Mins Per Assist:
Leroy Sane top with 160.7mins
Sancho Ranked 2nd with 160.9mins
Mins Per Key Pass:
Dimitri Payet top with 21.2mins
Sancho Ranked 27th with 34.5mins
Number of Key Passes to provide an Assist:
Leroy Sane top with 3.8 key passes
Sancho Ranked 4th with 4.7 key passes
There are only 19 players aged 22 or younger who have had more than 30 key passes in the league this season (serie a, bundesliga, ligue 1, la liga and premier league). Sancho is the only teenager. The big difference however is that Sancho's other numbers are significantly higher than his counterparts. Only Brandt, Mbappe and Brais Mendez are near to him. He's the most creative young player in Europe right now. He's scored 7 goals which some might argue is pretty low to be offering that amount of money. Yet he's only taken 21 shots on so far, 12 on target and 7 being goals. That's a shot accuracy of 57% and a conversion rate of 33.3%. That's pretty damn good. Rashford conversion rate is 16%, Martials 30.0% as a comparison. He's the real deal.