Two reasons a) Playing first team football's better than playing in the reserves, even if it is for a bigger club. b) The side will be better once they're in it.
Not sure at all people will be queueing to sign Macken Da Silva is good enough to play in a top championship/lower Prem team but if he isnt in the shop window no one will be coming in for him - he is much better off looking good for us than on the Everton reserves subs bench. I think getting them both back either as signings or on loan for the rest of the season is definitely possible