Isn't this all a pretty well established way to mitigate costs - see where you are at the end of the loan and if in contention for promotion review the situation but if the season is looking a dead duck off load the players to cut costs for the second half of the season?
You see it a lot at the lower levels where non-league clubs might have half their team from 'rentasquad' in an endeavour for a good cup run and a shot at promotion and if things don't work out then all the loanees start to disappear