They don't know..

They don't know how much he wants to bond with them.
They don't know how much he wants to be friends with them.
They don't know how much he wants to play with them.
They don't know how much of his jokes disappeared from weekly trainings
They don't know how much he changed from year 1 to year 2.

They still don't know,

because he can't do any of those.