Cucurella for 30m + Colwill with a buyback. That's a good deal.
I would overlook the lack of height if the player has the technical ability, ball progression of Cucurella. With another CB (Fofana), we won't need Cucurella starting every week at LCB either since Fofana, Silva, Koulibaly can be fielded.
This is actually a massive Alonso/Emerson upgrade and one that we were crying out for since the Chilwell injury derailed our season.