You can't know that.
He does remind Vieri a bit imo...Physical,Lefty,Good Technique.
Ofcourse it's hard to tell if the talent is the same level or if it's anything close to that
,but he has potential imo,and if you will not take the risk,you won't find out.
What i found interesting from checking out stats of Italian forwards:
1.Most of them starting to score good(15+ goals per season) pretty late (26-27yrs average).
2.Most of them moved to a 'Big' Serie A club at the age of 24-25 on average.
3.They peak at 28-30yrs.and even have good season later on.
Based on stats of:
Vieri,Vialli,Signori,Ravanelli,Inzaghi,Toni,Di Natale,Montella,Gilardino,and for comparison also included few 'weaker' guys
like Quag,Pazzini,Chiesa,Di Vaio and Matri.
Didn't compare SS's...(ala Alex,Tottim,Cassano).
If looking on Vieri stats btw,Nothing special until 24yrs:
Games - Goals - Team - Year - Age
19 7 Atalanta 95-96 22
32 13 Juve 96-97 23
29 25 Atletico 97-98 24
26 13 Lazio 98-99 25
21 15 Inter 99-00 26
32 19 Inter 00-01 27
27 25 Inter 01_02 28
35 27 Inter 02_03 29
32 17 Inter 03_04 30
36 16 Inter 04_05 31
23 6 Milan+Monaco 05_06 32