encouraging ziggs to go bot but discouraging kog'maw mid

kog had a ~1.5% play rate mid due to viability being shifted from AD to AP post patch 6.18. kog mid didn't make the game any easier with syndra and oriana being top picks and the occasional oppressive yasuo or zed. kog maw cleared too quickly and had pretty good harass which is how ziggs functions botlane. ziggs out pushes and out harasses the enemy adc leaving an open (and incredibly weak) tower.

if the main argument for kog is "he is supposed to be a marksman" then why does he have ap scalings on his abilities? the only ad scaling is his ult and it scales off of bonus AD which isn't built as much because of max output of W. you benefit more from building ap than ad but its discouraged. i honestly think its pretty hypocritical to allow "meta-breaking picks like Ziggs bot" (source: The Rift Herald) but restrict kog'maw ap midlane capabilities.

cited:

http://www.riftherald.com/interviews/2017/1/12/14241022/ghostcrawler-adc-marksman-lol-interview