[quote]I've always imagined that without the bit of machinery made specifically to channel/create aura ala what Penny can do, his Aura's protective ability would only be limited to the fleshy bits about him, which are really just a few organs and most of his brain.[/quote]
[quote]We know Penny is capable of producing aura, but what we haven't figured out yet is if she could manifest a semblance. [/quote]

[@Lucius Cypher] But Penny was a prototype signifying that the tech involved in her construction is state of the art, experimental and one would assume highly classified at the top levels of the Atlas military. How would Gren who it has been clearly stated has outdated hardware have such a device?

Wouldn't it be more plausible to say that while his aura in overall strength is equal to that of basically anyone else in order to use it like most people use aura he has to channel it through his cyborg components like most hunters channel their aura through their weapons. It would produce the same effect but because the aura is protecting a secondhand source the overall potency is lower. It would also mean that Gren's aura wouldn't be passively protecting him. He would have to will it on in combat situations which means significant damage could be inflicted if he was caught in a surprise attack.