Ok now I'm curious and open to the idea (vested interest in making more women). Convince me that Iguazu is a girl (please and thank you).
And because she's so desperate to prove that she's better than 621 specifically, even if 621 doesn't really do anything worth the """hate""" at the dam. And we don't think it's hate, we think it's a want to be like 621. It's not unreasonable that Balam and Arquebus have incredible intelligence networks. We like to imagine Nile specifically looking into Walter's new hound at the behest of Michigan because they have History. Iguazu learning that 621 is not only a gen 4, not only transitioned, but also happy where she is under Walter would make her incredibly jealous. We're now realising this sounds like a bunch of barely connected nothing.
But mostly it's her AC, Headbringer. Headbringer is a variant of the Melander frame, which is lighter in the core, legs and arms, but heavier in the head (we believe the extra sensors on the side of the head piece could be mimicing Iguazu's haircut lol), but the main thin with C3 is that it's different
Iguazu took the Melander, the ""one size fits all"" Balam frame, a standard (like how masculinity is viewed as the standard) and changed it to be more her style, more comfortable (this can be viewed as any combination of things relating to transness, but we really like the idea that it shows her want to change herself and how she sees herself as a part of or As Headbringer more than a human(we believe this because we like to think Gen4's like 621 and Iguazu link with their AC's so dramatically that their bodies start to feel uncomfortable))
But also because we likies her. Very muchly. Sweep sweep