I guess thats not too bad then really about selling the player, I don't see any point of Power Training any 4* players since they are so far behind skill points wise than scouts and high-end 5* from the transfer market.
It can be worthwhile look at Bale for me and my Miku was a 4* when signed.
Season 1 League: Winners
Season 2 League: 2nd, Champions League: Runners up
Season 3 League: 1st, Champions league: Quarter Finals, Cup: Play-Off