Yeah I've wanted to know what's up with this as well. Mine are at 0 too except Franklin who has $500 from one of the towing missions. I'm kinda ocd about my stats and I like to keep my wanted stars evaded stat equal to my wanted star obtained stat and it bothers me that after trying to keep them equal, that missions with multiple characters and a wanted level,(example Paleto score) only give the character your playing as at the finish credit for stars evaded.
I also want to know what makes the missing gap between kills and armed kills. Vehicular kills are some but don't account for all of them.