I think you are missing the point of the synergy of Niman vs Ataru. A Niman disciple can use a force move if he misses something the Ataru can not. Sure if the Ataru hits it's a "blast" and so it's talents are geared towards heavy "damage" (crits and damage itself or other effects) but it's not like it's Hawk Bat Swoop is in a vacuum, it should synergize with the other talents and so while if an Ataru hits he hits hard but if he misses nothing happened, the Niman on the other hand hits moderately but might hit constantly with his move power (and all the other effects you can creatively come up with).
Also don't forget he gets defensive training and the Sum Djem which the Ataru doesn't (though Ataru gains saber throw, but with the recent headache it gives i am doubtful about the benefit of having it on a single spec Ataru having only one FR).
So yeah, talents should synergize.