Watched him a couple of times now for Firenze & he looks like an intriguing prospect. So far what I've gleaned is he works his socks off, holds the ball up well, is a very calm & confident penalty taker & is a nuisance for defenders when in the box. May need a few more seasons to possibly become a world beater & its difficult to judge his goal scoring ability in Serie A & when he's not banging them in say a more tighter competition as say the Champions League when you only get a few opportunities to score & the margins are finer.
So far he seem's like a poor man's Haaland, which isn't necessarily a bad thing & he's at a different chapter of his footballing progression than Erling. The main difference is currently Erling just seems more clinical at the moment & has proved his worth in scoring goals in the Champions League.
The inevitable new contract Dusan will sign or forced to sign by Fiorentina will most likely insert a release clause close to triple digits, so whoever pulls the trigger will need to be confident of his value as it won't be a cheap signing.