Both of you are correct, King debuted in rd. 26 2001 in a match vs Brisbane at Gosford, which we lost 42-14. Watmough debuted in 2002, Brett debuted in 2003.
As a point of interest, we do actually have 4 players who debuted earlier for their first clubs, as Robertson debuted for Canberra in rd. 22 2001, Perry debuted for Newcastle in rd. 17 2000, Lyon debuted for Parramatta in rd. 21 2000, and Galuvao debuted for the Warriors in rd.8 1998Â