"Why is Crazed Cow so high? They're expensive with low damage and outclassed by Rock."
The main reason Crazed Cow is so high is because most of the other Crazed cats are not good anymore. The next best options being Crazed Cat and Crazed Fish are often overshadowed by better units which goes for most of the other placements. While it is true that Cow is outclassed by Rock in serious stages, Cow has the unique leverage of being one of the best rush units even today with clearing tiny peons and speed. This factor of convenience is enough to put Cow above the other Crazed who don't have any sort of leverage. Cow is also strong alongside Rock on Yulala stages.
"Why is Crazed Gross so low? Aren't they a cost effective peon clearer with great synergy?"
Gross used to be one of the best Crazed since their wave attack was incredibly unique. But in the modern meta, Slime cat completely outclasses Crazed Gross as a wave chipper, peon clearer, and cost effective attacker which leaves Gross to rot in early-mid game content exclusively.
"How is Crazed Titan worse than Crazed Axe?"
Both are horrible units with next to no usage. Axe has the quality of a money combo which is used in quite a few cheese strategies. Titan has no good uberless combos (his uber combos aren't notable even if we did account them).
"Why is Crazed Cat so high? He's just a somewhat fast meatshield that gets beaten by tankier meatshields later."
Crazed Cat is still the optimal choice on stages like Floor 30 and 40, but Crazed Cat notably has a tech where you can pair his first form with Manic Eraser to even out their speed, then alternate their spawn pattern to get an incredibly strong meatshield flow. This strategy completely annihilates Jagando and was also used as the main form of stalling in Super Hyppoh before Jetpack existed.