So far, the only skills that work with Combat Orders are Starforce Salvo, Hero's Will, Starfall. Maple Warrior, and surprisingly High Gravity. Back Up Beatdown and Planet Buster don't work with combat orders and neither does Starline 4 but arguably doesn't need to since the nodes make up for this skill which receives higher damage than most 4th job nodes for other classes. I'm asking for this mainly because they are skills commonly used in Jett's skill kit.
Level 32 Planet Buster would have 4 second cooldown, max enemy hit: 10, 1180% damage, 5 attacks.
Level 32 Back Up Beatdown would have 8 enemies hit, 260% damage when held down and the final attack would deal x% damage
Strikeforce Showdown, Invincibility, and Giga Blaster should also be included in skills that could have their max levels bypassed by Decent and Normal Combat Orders, as well as the +1 passive skill legendary ability.
Giga Blaster, Invincibility, and optionally Strikeforce Showdown, should also work with Decent and Normal Combat Orders, but also with the +1 passive skill level Legendary Ability because these skills are passive. I only say optionally for Strikeforce Showdown because of the activation chance, but there's no nodes to enhance this skill so it should be considered and included.
With Combat Orders, Strike Force Showdown at level 6 should have a 12% activation chance, deal 425% damage per hit (10) to 1 enemy. Not too over powered at all with Jett's current state. Level 7: 14% activation chance, deal 430% damage per hit (10) to 1 enemy.
I think Strikeforce Showdown was originally supposed to have it's max level cap increased through Combat Orders but might have been coded wrong, because there's a bug that allows Blaster Barrage and Volt Blaster to have it's max level exceeded with Combat Orders but may have been mistaken for the Starforce Salvo and Strikeforce Showdown skills, which are both identical in which the main skill is hold down while the latter skill enhances the former.
Giga Blaster level 21: 71% mastery, 31% critical damage. Level 22: 71% mastery, 32% Critical Damage
Invincibility level 21: Damage: +11%, Max HP: +41%, DEF: +26%, Abnormal Status Resistance: +21, All Elemental Resistances: +21%. Invincibility level 22: Damage: +12%, Max HP: +42%, DEF: +27%, Abnormal Status Resistance: +22, All Elemental Resistances: +22%