I remember Rick Brunson...he never started a game with the Bulls in his 2 years there. Careerwise he started 51 of 337 games, so not sure if he qualifies.
Brunson came off the bench hot in his first three games, scoring 12/17/10 on 70% shooting. Did nothing the rest of the year...Bulls send him to Toronto...he comes back to the Bulls and in his first 4 games he has totals of 12 and 11 points, then does nothing the rest of the year.
for danger level, probably a meaner bull on his back, better sheer power at 2200lbs. But both those Bulls were pretty cool cats once you were on the ground, they were curious but not malicious...meaning they weren't keen to attack a downed rider.