Ask a Warrior Thread.

Yeah Buster to Dragon Knight is like Brandish to Crusader. That's why I used my SP Reset. I'll go on my DrK to check what skills I maxed, and post them up once the update is done.

brandish gets replaced in 4th job though, no? so you still use it for the whole duration of third job.
DK get buster at the same time they get fury, which is a much better training, and you won't really be bossing at level 70~120 (or if you ARE going bossing, say at level 100, you'll have already maxed sacrifice)

with such good alternatives for third job, and both buster and fury getting replaced with impale at 120, there realy is no reason to max it at all.