Kai's WEAKEST poses are the side poses. Whenever he turns to the side, it's clearly evident that his belly hangs out further than his pecs. For Kai, its a "Side Belly Pose"
On the side chest pose, it actually looks like Kia is using his arms to HIDE his epic beach-ball belly. His belly is like an inflated balloon. Unfortunately, it will never deflate.
Besides, his arms are not big enough to hide his gut. The audience see's it regardless. His giant tummy makes his pecs & arms look small on the side poses.