this is one of those things where no amount of previous experience from other fish keepers will stop someone from trying a combo...with plenty of experience with gars and various combinations as well as observing other combos firsthand, i can tell you that this combination is not advisable.
often times people really want to try things and will do so no matter what others say...you can try it if you want...your choice, but you've heard from 'the gar people' and i think you have the general consensus.
gars may try to eat food larger than their gape limitation, this has been seen countless times and may kill one or both of the fishes. pbass can be very aggressive and outcompete gars for food or spook them into breaking their backs. it's a bad combo, but test it if you want; good luck--
--solomon