I just played a game as twitch, was fed, my build was IE,youmouus,double pd,BT, And the next item slot could be Merc scepter, or last whisper. +baron buff and pots, and Rat tat tat, twitch could have 2.5ATK speed with stealth proc and youmouus, 100% crit, and 551 AD, easily doing 1k crits per auto with 2.5 atk speed, along with twitch ult, I believe this is as far as a hyper carry can be.
with 10% crit/AD runes and build of 
and 
. Fear them and they dead before they can move lolz.
I'd imagine kog'maw could do better, but still very scary.
Twitch with ult and an enchantment: devourer with 2^31 - 1 stacks.
I think this is the best because kog only does single target autos, with the boots and zephyr build you get more move speed but you sacrifice damage for it, im saying twitch in this because his ult gives range,ad,and aoe. and his stealth will already give excess atk speed if you build too many atk speed items.
