Regarding the point of promoted sides, you might want to read this (bit old, but still relevant?)
http://www.financialfairplay.co.uk/latest-news/premier-league-update-their-ffp-rules
Specifically this bit
It is interesting to note that the rules allow a newly promoted club to immediately increase wages to £67m if they wish. So we could, in theory, see a club like Brighton increase their wages from somewhere around £18m (excluding promotion bonuses) to £67m over the summer.
(Told you it was old, as it quotes Brighton as coming up!)