I also think his blue magic didnt work well as a Overdrive and wouldve been better as a unique skill. It couldnt have been that hard to give it to him, after all they gave Yuna summon so maybe it was the designers intention to make Kimahri use it as a limit.

I also once tried to make Kimahri a black mage, my thinking was that if he was ever low on MP he could use lancet, He also has an awesome spell casting movement, (Talk to the hand, boom). However he was quite in-efectual and i now use him as a second Wakka.