Well there are two options:
1. Dry Loan - We get a player back after impressing and his value and attention rises so we can sell him properly
2. Dry Loan - We get a player back after disappointing and his value practically stays at 0 BUT at least we got a year off his contract..
3. Loan + Option - Its like a promotion to the specific club which makes it more likely to happen compared to a dry loan. So of course it splits:
He impressed he is gone
4. Loan + Option - He failed to impress - same as option no`2