Because if he is on a contract insanely far under his value, that of a decent Championship player when he is clearly far superior than that, makes it all the more difficult in situations like this. You’re asking someone to stay professional when his salary is going to be increased by at least 10x if he is on £10k, and god knows how many times if he is on that rumoured £3.5k. We can all comment on his unprofessional behaviour, but 90% would do the same in his position.