Make the Auto 3 be a level 15 tank

It seems kind of random that Auto 3 branches off of flank guard (how does 2 barrels relate to 3 non-controllable ones?), so naturally it would make more sense to put it as a level 15 tank, especially considering that it is too UP for a level 30 tank. The Dev could even make the entire Auto Tank line be it's own tank branch, with Auto 3 as the level 15 tank, Auto 4 (returning from the grave!) the level 30 tank, and the Auto 5 the level 45 tank. If this was added, you would start off as a small tank with 3 auto turrets, and gain a bit more firepower each time you level up. This would make far more sense than just A) Upgrading from a flank guard to an auto tank, and B) Adding 2 turrets at a time instead of just gradually rewarding the player with them.