Cordero should get a preseason and then be loaned to a Segunda (or maybe even La Liga) team if he wouldn't have a spot in first team. Unless we'll invest some money to bring him in January then he'll probably play for BA next 6 months but that's ok imo. Better play on a lower level for few months (could still benefit training with and potentially get some first team minutes) than sit on Malaga's bench. Could be wrong but think he won't play much for them anymore if they'll know he's leaving (understandable from their perspective but ofc not good for his development).
Bring him in in January and have him as part of A team dynamics. We won't get a cheaper dribbler option for the left this window.
By comparison Yeremay (Depor) is rumoured with PL moves to Newcastle/Chelsea for 20m.