No. I never mentioned transfer fees...
So you are implying if Mata was playing first choice as number 10, keeping Kagawa would not be desirable.
You have accepted Louis van Gaal seems to want to move toward 4-3-3 and he is working on this. 3-5-2 is a temporary solution.
You have suggested Angel di Maria or Adnan could replace Mata in the event of an injury or rotation. Yet then you must imply Valencia or Young should play on our wings.
You have suggested Herrera could play 10 but you then must seem content with Anderson or Fellaini as an 8.
You have otherwise implied it is ok to move Rooney from number 9 to 10 back to 9 instead of letting him build momentum in one position.
Keeping Kagawa would be the easiest solution unless a fair offer came in for him. As it is he is being sold for an offer that suggests we just want to get rid so when Louis van Gaal moves to 4-3-3 he will likely choose RVP + Rooney and drop Mata.
Kagawa at this point really is not needed and should be sold for any price.
Now in your reply address why you think Young and Valencia are fine on the wings when Angel or Adnan replace Mata.
Also, address why you think Marianne or Anderson are fine in the middle when Herrera moves up.
And also why you think Wayne Rooney will still perform to his absolute best even when he is not allowed to develop momentum in one position.
Otherwise accept if Mata is chosen ahead of RVP then Kagawa would still be useful to keep around thus selling him for a fair valuation only would make sense.