Shockingly enough yes, and I got 100% as well.
But he did help Tommy in the storyline, remember Phnom Penh 86, who was flying the helicopter, I believe it was Lance... and one of the drug missions for Diaz (forgot whats its called) first you were driving the boat to get to the boat for a drugs deal, and Lance was shooting, then they switched roles...I know he betrayed Tommy but he was a good friend to him before