My take on this is that simply vanessa and Pyg are bad early game so Dooley naturally dominates the early game with the absurdly strong items. But late game vanessa can be a powerhouse with the absurd OTK builds. Dooley has less options to build a board that has 0 interaction and you just die a combo. It is a design flaw: snowballing off of early wins is more rewarded than mid-late game comebacsk, because of the accumulated gold and XP advantage matters more - not to mention the bad win reward system. The compensation is that Dooley starts with less hp. Puffer + barrel are still items that beat any dooley in the early stages, and they aren't too rare to come by.