If this happens, he tarnishes everything he did here IMO.
His reputation, despite the protracted and rather unprofessional ending to his reign here, is maintained amongst the fanbase, given the remarkable job he did here, and his battle with Chansiri ultimately running him dry.
But, there's PLENTY of jobs he could get...better and more attractive jobs, than United's at present. In taking the United job, he's showing exactly what he thinks of our club and the fanbase that worshipped him.
But, as a ruthless careerist (and that isn't a criticism) I suspect, he'll only view it as his next job, and anything in the past, is irrelevant to him. I sincerely hopes he thinks twice, if the opportunity arises...but given that this news is out, he's probably already given the nod to it, should Selles fail to recover the situation down there.