He's still learning the game, asked to play real physical and played a ton this year AND is still growing. His thumb healing throughout the season I'm sure messed with his rhythm. Got used to it, heals more, change the bandage, get use to it again, heals more..etc.
That drop early on was catches he made routinely in Spring, Summer and early season but that was awhile ago. Another year in the weightroom and a healthy hand could me a huge year next year for him.