Paperwork fairy was clever in the 1st place;
She put Maguire on a Youth Loan (as under 21) A Youth Loan can be extended until the player reaches his 21st birthday. (Sean's case 1/5/15)
Johhno was 21 on the day he signed for his; thus coming in on an emergency loan; which as people correctly state is for a maximum of 93 days.
Simples!!!
