Dillon has lot of seriously good stuff.
-His pull cocks his elbow.
-He brings the disc in close to his chest.
-He extends to the apex of the wrist snap as good as anyone I have seen post for review on DGR. His wrist is the other side of the disc for a foot beyond his chest (closer to the target). When he hits the end of arm travel, the wrist unloads as result of forward motion. His powerful wrist extension, as a result, is effortless. This is due to the fact that he uncocks the disc down the line of his arm (as a unfolding whip) keeping his hand on the other side of the disc as long as possible.
-His hit focus is forward not off to the side. In other words, his pull is linear and close to his body focused to a point point 2 feet towards the target. Heck, look at his pre-shot primer, he is holding the disc at full extension, and then he simply coils and goes through that spot.
***NOTICE****
Everyone look at this follow throw. He is literally thrown forward by his own disc momentum. That follow through is not result of MOVING forward, his back foot is THROWN forward by hitting PAST the length of his own arm.
The ONLY reason his arm swings out hard to the right is that he is coupling his arm and shoulder swing to his uncurling wrist that unsnaps at the forward apex.
I believe this is an discussed fundamental.
***NOTICE****
-I love this body motion. Right down the line. Nothing is wasted.
He will needs to start to understand the elements of each one of these things to improve. Then all he needs to do is do each even better.
Actually, I think Dillon throws like I would teach. Balck Uddder and I have been discussing this exact action on the Masterbeato thread.
He might actually achieve more power if he pulls slower and gets the disc cocked even more forward, focusing then on accelerating from the pec to the apex. Other than that, I am not sure I would mess with much... I can see how he is throwing over 400'. If he were an adult he might be throwing 500'

plus.
"The reasonable man adapts himself to his environment. The unreasonable man adapts his environment to himself, therefore all progress is made by unreasonable men."
-George Bernard Shaw