The only one ever worth his salt used to be JJetset. In the Harry Redknapp era he def had someone on the inside - probably Harry himself as he seemed to know everything going on - the rest of them are chancers.WLB is close or thereabouts, and Dragon 1 (form another Spurs site) pretty close.
As for the rest, they are no more ITK than Mystic Meg was.
The random ITK always seems to be the best, sometimes people do over hear stuff or get an inside line out of the blue