Chronoforce is definitely too abusable in Advent. I mean, really, a time attack that affects all bosses, they had to have seen that coming.
I don't know that I agree with the whole "specific method to take down bosses" shpiel. That's really more personal play style than anything, rarely is there any single "best" way to do things, due to the abundance of forms in ZXA. Not counting Chronoforce, that is. The main thing limiting you is the shared BME, and if you're stuck without it, you either go for Model A or ZX's saber combos, the latter of which arguably does more damage anyway (available weapon energy simply means chaining it to a charged buster).
Consider also the actual game progression in battling Pseudoroids in ZXA and how it interferes with various methods which come to mind under the argument. When you meet Chronoforce, your selection is Model A, Buckfire, and possibly Rospark. None of those are ideal.
And there's no boss who is weak to the Recoil Rod. It doesn't help you to actually deal greater damage to any boss, the flinch effect is just handy for disruption. Really, in Zero series you simply maul everything with the saber, be it combos or charged saber (1/4 a life bar from a single neutral-element charged attack is nothing to sneeze at in any situation).
Concidence or intended?
I'm pretty sure the six-to-twelve-wings-with-circle-behind shpiel is typical of "divine" characters in Japanese fiction. See G-Gundam.
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