Costa for 25-30 is great, but I'm guessing it will be 35, which isn't great, but if we keep our core then he's a great rotation addition.
However, fact is we'll probably play 3-5-2 against RM, meaning we need a capable starting RW, as Allegri doesn't seem to trust cuads (or Alves defensively....) on big occasions.
The important thing is to keep everyone here, except Stu and Lemina obviously.
btw, socially speaking, Costa will fit right in with our south american community, and that's as important as his capabilites.