I've not seen much of Lingard, but I'm sure I remember him having an excellent first touch. Mourinho will know him quite well, and must believe he is a good player; it was obvious from that documentary that he was going to radically change that squad from the one he's inherited.
He's a good player when he has confidence. He is a better option for United than Dan James. Might be a bit of a prat, but he has the ability to be a good player. He is a united fan so is probably unwilling to leave, but as long as ole is there then think it's best if he does.