That's been the issue eve since S3, the jungle in the highest elos is always dominated by a few champs that just do everything one could dream of in the early.
Outside of a few niche picks, all competetive junglers since then combined strong ganks, fast and sustained clears and either good duels or atleast reliable escape to avoid bad fights, makeing them the gods of the early jungle if properly used.
Also, the idea of very powerfull early ganks strikes me wrong.
The only 'balanced' way is a really bad clear, which results in a hit or miss situation, where your entire game depends on how succesfull your first 1-3 ganks are(hello shaco), cause if those ganks are succesfullyou just keep impacting lanes left and right, and if they fail you'll fall so far behind that you most likely won't have good ganks in the future, just falling more behind because of bad cleartimes.
It also means as long as this type of champ is open to pick, one needs to pick save laners.
Imo no jungler that has rather reliable cc and good mobillity or alot cc should also have high early damage.
This is what breaks rek, gragas lee and co, they can easily get to you and even cc you while also heaving enough early damage to kill laners all by them self.
If you compare that to nauti and seju(that also have worse clears which ads to it), they have the cc and mobillity, but they don't have as much damage, or atleast it's more backloaded, or a champ like graves(that guy has other issues though) that can bring alot damage, but has no cc and not the best mobillity.
Those champs either require damage followup or a cc setup from their lanes for a succesfull gank.