the player XpEcTz on halo 3 has barely any kills on his heat maps why?

[f1r3f1ght3r11]

it says he has about 17,000 kills. then when you go to his heat maps it barely shows that he has that many kills. like the more you kill ther more red, blue and the other colors the kills represent. but on HIS it doesnty show that namy.. how come??