pfim
Player Valuation: £35m
Capology (https://www.capology.com/club/everton/salaries/) estimates his salary is about 80k - not sure how reliable the source is.
The cost to acquire a replacement and pay that replacement is going to be similar, and there's lower risk with a one year contract.
You know what you're getting with Gana, good (great) and bad (bad).
Besides, we need at least one more in the middle for the squad, and a replacement for Onana if he leaves.