I was just re-doing Amaurot and what Emet said earlier made me think:
"Do you honestly believe that half your number would sacrifice themselves to save the other? No, of course they wouldn't!"

But would they if they thought it was heroic? Isn't that what heroes do?

It's what the WoL's did - we just told them as much. They sacrificed themselves, and then again in order to save their star. I'm not sure how a fight might go down between us and the WoLs, but Elidibus might not need to convince them to fight against us directly, just using them indirectly as fuel for whatever cause he tricks them into believing.