I was curious about this! It turns out that math is a bit off - the LO overtakes another Ballista after 4 (not accounting for the 40 point LO premium).  Comparing 4 Ballistas with LO to just 5 Ballistas, when taking into account only the passive +1 to hit, the1x shots will do roughly the same damage (7.76 vs 7.80) while the 4x shots will do considerably more (18.68 vs 15.55). I did not take into account the Command Ability, as that would require a lot more point weighing and measuring what