Ferran is one of the smartest attackers out there, I am not sure why throwing his name, he is just a limited player who doesn't have the skills to make use of his brain.
Doku is the opposite, raw talent but limited decision making. Players like that are good in producing chaos against smaller teams who park the bus, like Adama or Dembele.
For a loan he is actually decent, assuming City are covering part of his salary.
Otherwise, thanks but no thanks.