The crucible has been quite notorious in the community for a while now. Please be aware that Bartz is not required to be in the main party for to manage the orb.
The orb condition is for the boss to take elemental weakness damage, and is a +2 to the orb if they wind elemental weakness damage. The rub here is that the bosses are immune to all forms of elemental imperil debuffs. This is clearly pushing Bartz, as his wind imperil is an aura, and not a debuff, so it bypasses the debuff imunity.
The way to avoid bringing Bartz along, is to attach his base call ability to an off turn damage unit such as Cor, Yang, or even someone like Ace or Trey. If you pair an off turn damage dealer with a turn hogging character such as Tidus, Terra, CoD, or Lightning, you can have the orb be handled by the off turn damage while you rush down the bosses.
For this run, Yang was my off turn damage unit, and Tidus was my turn hogger, with Porom being brought along to help with the batteries.
Another thing to note is that Kurasame call will not work here since it is tied to an elemental imperil, and Beatrix's LD debuff will also not work here, since it now applies thunder imperil after her LD boards.
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