Firstly, figures of what terms players have offered or earn should be discounted. It would surprise many what Motherwell actually offer...
The Slane story has been mentioned more than once, our information has it his father is doing his bidding and has turned his head to untold riches at the San Giro and similarly to that of James McCarthys' father, it helps not having to put his hand in his pocket at whatever republican drinking hovel he finds himself in.
Now, as I'm biased (hell, I'd wager neutral outsiders looking in would view this the same) and taking money aside, why would you hamper proven development and the possible future rewards for your offspring? You would question personal ambition too.
As for O'Brien, word from his hometown differs to the opening post. A recent spell in the media suggests different too. If only he was as good as is lauded too on this board...