I don't think its a question of right or wrong posted by the OP. Lets look at this:
- Juke does not belong to us
- Chances of us signing Juke in the Summer are slim to none - especially if he does keep on scoring as Boro will up his price unless there is a term in his loan agreement that means we can sign him at the end of the season for a set price
- This season is a write-off. We won't get into the playoffs and we are looking more at the teams immediately below us and around us to avoid a relegation scrap.
So imo, Juke can bag a hat load of goals for us, but what purpose does it serve the club long term? None. Great we will pull away from the bottom of the league, but then what? I really don't understand DFs sending all the kids out on loan crap. He should be assembling our own players now and getting them playing together in preparation for next season's absolute must promotion.
To come full circle and answer the OP, the answer is it doesn't matter. He's not our player and the fact that he is in the team is keeping one of our own players out, especially the young ones. Now, if he is going to be an integral member of the squad for next year (imo we should be breaking the bank to get this guy) then definitely he should play, but he should be paired with one of OUR youngsters and not another loan player. Strange saying that in light of how good Mason was, but we will not be buying this player either. I'm really trying to understand DF's logic, but whichever way you look at it appears flawed.