I still think that if Osman isn't in the best 11 then he isn't a first pick, but anyway...
Considering how good Barkley is, how much would an "adequate replacement" cost? You're a blue, you know the constraints financially.
It's not ideal but unless we find a sheikh we will always have Osmans and hibberts padding out the squad in case of injuries to our first 11.
You find a middle ground between "not as good as Barkley" and "not as bad as Osman". That's what the loan system was made for really.
If there is such a gulf in quality between your first choice player in a position and his reserve, you need to narrow that gap. We can't afford Osman to be the first choice pick in attacking mid if Barkley is unavailable.