Anything You Can Do I Can Do Better
So Chloe hasn't been able to mimic Bahamut's power so far, but what would happen if she did seems pretty obvious: she could take more dragon forms, either knowing the ones Beverly doesn't, or being able to access ones Beverly will never be able to.
Likewise, after the museum scene, I think we also know what would happen if she copied Medley's powers: she'd be able to control the shape-shifting.
What would happen if she copied everyone else?