Disembowel has no position requirement...that's Impulse Drive. DRGs could certainly use a bit of a boost but in reality the only time where it really matters is in raid groups trying for world firsts. The DPS checks even on Final Coil are well within a solidly geared DRGs range. Taking a NIN or MNK might give you a tiny bit more cushion but once you're sitting at i115-120 it isn't going to matter that much unless you're that concerned about finishing the Turn a few seconds faster. Who cares about perfectly executed rotations? How many execute perfect rotations against anything but a training dummy? I keep up pretty well with most MNKs I've run with and so far do as good or better than the NINs Ive run things like Shiva with. In short, while I agree DRG could use a bit of a buff, I don't believe there's any reason not to take them to endgame.