User blog comment:Death0411/Altaire, the Shadow Gunslinger/@comment-67.22.77.106-20120812224559/@comment-69.140.198.72-20120813210429

Draven's DoT doesnt' stack only refreshes and is dependent on crit strike or Q auto attack buff which need to be caught to maintain the DoT on hit effect. aka making keeping the single stacking DoT very difficult and risky since you have to catch spinning axe to refresh Q and reapply DoT. This champs DoT is higher, doesn't require a resource, and is constantly passively applied.