Corki gets a buff and starts showing up
in mid lane once again.
WHAT A SURPRISE
> We see an opportunity to help him out: we like him as a magic-damage option for the bottom lane marksman role. These changes are designed to reinforce that by making him a more palatable pick in bot lane, while further pushing his magic-damage niche
Riot buffed him so that he would see play bot lane again but instead is being played mid while his bot lane pick rate is the lowest of all the ADCs. Riot wanted to make a unique ADC who dealt magic damage but instead gave him the tools to be a mid laner instead. I feel Riot really dropped the ball with Corki when they tried to make his niche as an ADC magic damage dealer unique. If they really want to solidify his role in bot lane they need to change his package in a way that doesn't make him an excellent roamer when in a solo lane but pretty weak for an ADC. Honestly I think the package should be scraped in a favor of a different passive.
Edit: this blew up way more than I expected, hope someone at riot sees this.
& AD
Jungle:
Mid:
ADC: duh
Sup: 
was. increase champion diversity on bot lane, and marksmen can go into other lanes aswell.
-if-you-want-to-function