"Graves has an unreliable early-game, so we buffed him" Meanwhile, Shaco?
Shaco is a feast-or-famine assassin whose abilities by themselves deal absolutely zero damage. He scales entirely with items, but he needs to get those items fast (through lots of early-game gold) or he'll fall behind.
But he can't get those items or that gold without killing people.
But he doesn't deal any damage in the early game.
Because he can't deal damage until he gets items
Which require gold.
But he can't get gold... -- you get the idea.
All other assassins in this game don't have that problem. They have good base damages and superior tools to kill enemies in the early stages of the game, so why does Shaco have to suffer through that until everyone is full build? I think a tiny bit of early-game power buffing so that Shaco is actually a threat to his enemies would be more than reasonable, given that he can't stealth into a lane and attack anyone before his stealth timer runs out early on and that his boxes take too long to arm with the low level stealth timer.