A hot dumpster fire named Kog'maw

This is just my opinion, but I'm going with it.

All these ADCs are getting buffs and changes, but kog'maw has been consistently bottom tier for the better part of the season. He received a buff to the range on his rank 1 ult, but that is not what he needed. I heard a while ago that there may be work coming on his passive, but nothing has come. Rageblade, his core item received changes, those have had little effect on his position as a dumpster fire adc. I understand that he is supposed to be a late game power house that shreds tanks, but he is so immobile that you have to give up way too much to survive laning phase to be effective late. Even when you do get to the point where you are strong there is more than likely someone on the enemy's team who will dive you, and kill you since you have no escape or defense built into your kit.