To be honest, its probably got something to do with his lore*[slayer-pantheon-thumbs]. After reading it on my own time (and multiple times at that [zombie-brand-facepalm] ) I thought hard about his awakening and it made me realize, Kog'Maw is a scout or a spy for the Void tasked with finding out how Malzahar came to be. Basically, anytime Kog'Maw is interested in something he eats it, and whenever Kog'Maw finds something new he eats it (Q,W, R, and auto attacks), but he doesn't get bigger like Cho'Gath
. This is because he doesn't actually absorb all of the material rather he spits acids to deconstruct and analyze the material at an atomic level (Q and Wed auto attacks). Then if he needs to eat or kill a live target, he can slow them with adhesive saliva (E). Finally, if someone does kill Kog'Maw he just blows up and destroys all data that he collected and possibly any witnesses, this is what all connects it. To summarize everything Kog'Maw is researching Runeterra by analyzing everything on the planet by deconstructing matter and observing life on Runeterra, his other task is to find Malzahar
to learn how this non-Void being harmonized with the Void (Kog'Maw may likely kill Malzahar in the analyzing process[slayer-pantheon-popcorn]* ). This all seems confusing, but if you read Kog'Maw's lore and if you think of Kog'maw's abilities as a loyal spy or a scout, you will understand Kog'Maw's passive. This is why I like to Jungle Kog'Maw, because that is where he belongs in the lore, learning about the wildlife and investigating the locals. See you on the Rift. [slayer-pantheon-thumbs]