We call this efficiency.

Ferran Torres is definitely way better than Rashford, he's just underrated, he even score more goals than Mikel Oyarzabal for Spain.
Torres score 2 goals from 3 matches, Rashford contribute zero goal and zero assist from 3 matches, with his salary, Barcelona can find better player compared to Rashford.
Moving to Turkish is a good move, probably he can play with Onana in Trabzonspor or join Fenerbahce, Mourinho will able to make him discipline.