Also there's a chance that the really skillfull players like SD and Bruno might actually be more suited to the Prem where you tend to get more time on the ball.
Correct.
History tells us that if you sign too many players after you get promoted it disrupts what t you promoted in the first place. A team can be greater than the sum of it's parts, you shouldn't be changing more than 5 players at once other wise you're asking for trouble. The skill is...