Here's my take on separating the chal pics....RC - JP w/black shirt on....both Skupin and Malcolm wear left wrist buffs and have shirts on.
IC - JP wears a blue shirt....both Skupin and Malcom wear neck buffs and are shirtless.
The IN is only present at the one chal start mat scene....w/neck buffs and shirtless Malcolm/Skupin...and blue shirted JP
All wrist-buffed and shirts-on pics of Malcolm/Skupin are RC
Just my take