What you want, is a 3th forward. You want to make this team, far to offensive. The result would be the 3 cm's to work much harder defensively, wich limits them.
Oscar is a cam, who is more profilic then Isco, works MUCH harder then Isco.
Isco is good at going past 3 players when there is alot of space. Oscar is good to free himself when locked up by defenders and then gives a killer pass, or is good to dribble himself to be in that position.
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I was hoping someone would bring up Marchisio for an houre now