In town rebbe thinks: I can ignore this, he has his parents. Heck, I don’t even need to share my reservations with anyone.
Out of town rebbe thinks: I must not ignore this because this boy is far, far from home, and I have been invested with the sacred charge of en loco parentis.
I don’t get your pretexts, personally i feel a rebbe will focus on an out of town bachur more than an in-towner