That's fine but we have to accept we need a centre back when Maguire leaves, whether that centre back is KMJ or not.. It would be beyond dumb to leave ourselves with 3 first team centre backs with one of them (Varane) being injury prone, and having to weaken ourselves at full back because Shaw has to cover CB. We'd have just 7 first team defenders, we're meant to be looking to improve, not go into next season with less depth than we had this season.
If we do end up shipping Maguire at some point in the window, we better have a very shrewd cheap signing lined up, because if we go into the market and end up spending £35+m on his replacement, then it will beg the question why the hell we weren't proactive in getting in KMJ for £43m when we had the chance.
It's possible we were ready to pull the trigger on 1st July but he's just chose Bayern instead. However from everything we've read in the English press, CB was always one of those positions that was up in the air because we're waiting to see how much we spend on the priority positions, waiting to see if Maguire is leaving etc. lack of foresight, clarity, planning has been a staple of United in the transfer market for the last 10 years and I don't expect it to change this summer.
Maguire should have been told he's got no future here a long time ago, that he won't be captain and won't be playing in the first team so he'll need a new club in the summer if he wants first team football. From what we've read in the media I do get the feeling the club don't have a clue whether he's even willing to leave, who's interested in buying and how much we'd get for him, which puts all our plans on hold.