Hi Samuel (: Nope, getting koshka tanky doesnt mean less kills. You need to ensure you have boosted basic attacks though by using the second skill whenever you can on anything (minions on lane, petal's seeds, etc). Once you save up on those, it's enough to do a lot of killing. I use this build all the time and usually have the most kills in my team (:

I like the whole build but tanky makes Koshka get less kills. I like the way how you can carry with Koshka though.