He wants to warn you about his experience of leaving Palace to go to Tottenham. Bit like moving from a small club like Hull City to go to a massive club like Lesta. Proper f*cked up his career it did. Still his agent pocketed a decent wedge.
Not anything like the same situation. Bostock went to a big club at a young age. Stewart would be going to a similar club, albeit one with more financial clout, and would be playing every week.