I don't really rate Lance Hamilton, there are bowlers higher up the pecking order than he is. I was told he was quick, but when i saw him he looked pretty slow.
I'd say at this stage that Hitchcock, Mills, Franklin, O'Connor & Yovich are all ahead of him.
As far as Sinclair is concerned, he's got talent but until he starts shifting his feet he will always have a poor average against the better teams, despite scoring 3 big centuries against Pakistan, West Indies & South Africa who all have good bowlers.
As for unlucky players, I don't really think there are any in NZ right now, they've all been given a chance & either succeeded or failed. Maybe Gary Stead, who had a few good test matches for NZ.