It's has to be difficult being the best player at a given level for a long period of time (I'm speculating here - never happened to me personally
).
Always targeted, always expected to produce, and it must be hard to keep motivating yourself to continually prove your worth.
This is why I am 99% certain he turns pro after this year. He was the best player
last year - he's probably already bored other than his brother being there.
Why on earth would he spend another year there?