upgrade the other ability higher than rock throw

you dont know the true power of throwing rocks at your enemy ahahaha

no

As main the body smash skill doesnt show despite its lvl is higher than the stone throw.

upgrading other abilities wont work since the AI also factors in the best possible move to attack the unit first. So if it cannot attack anyone (with any skill) then it will use a buff skill. It would only use other moves if its close within range. So basically stone throw is your best range attack until you get within 1 or 2 panels(depending on the skills you unlocked so far)