actually, on a globals scale that is a good pool - if compared to previous seasons since S3.
It always there like 4-5 meta picks and a few pocketpicks here and there.
Prettymuch ever since Lee became gold-standart, forceing junglers to have either an similar insane early(good clearspeed, sustain, dueling and powerfull ganks), or a decent enough early with a far better late.
While lee actually has been nerfed quite alot(even if most people refuse to see that), the damage done remains and pro-meta jungler need a sick early or a good early with strong late. Oh, and savety, that's utmost important.
Every damn pro meta jungler aside from very few has solid escapes, atleast within the jungle, so they can escape invades while invadeing with low risk them self.
So yea, unless your overloaded as shit, you won't pass the test for projungleing, and that's the state of the professional jungle since start of S3.