Harry is not the first successful comp guy to cook his chicken to lower than traditional temp and have success. Time in the heat is key here and it is not just a black and white issue as it relates to internal temp and acceptable doneness.
There are also ways to have your chicken +190 degrees and juicy.
Peace and Smoke,
My Weapons: Custom rig - Kandi, UDS; Bubba Keg; 22.5 WSM x 2; 18.5 WSM; BWS extended party; BWS Gator and an Onyx Oven; 29' ft Coachmen Leprechaun (Lola).
Dan Chambers get well soon, so we can tell you to "Shut up Chambers"