User blog comment:AHarmlessTaco/AHarmlessTaco: Teemo Rework/@comment-11520377-20161024002919/@comment-26400721-20161024011403

Idea was:

Requires stacking and is a DOT and is primarily single target, so larger numbers seem beneficial. Plus this helps him to transition to an ADC-like state in the late game, so considering ADCs do 250% AD on every auto attack in the late game, this also seems almost reasonable.

But you are probably right.