The thought was like a firestorm in Sylas' head. The moment he had it, he just couldn't get rid of it. But unfortunately, as he felt out his Gene Talent on a much, much smaller level, he began to realize the problem.
The Gene Talent allowed him to make the Aether in his surroundings an extension of his body, true. But that meant that unlike how the Aether in his body was catalyzed by his Aether Pathways into his specific niche and what he benefited from most, the Aether in the surroundings was not the same at all.
Aether in this form was free-flowing, a mishmash of countless different types.
If you triggered a certain Skill, the Runes of this Skill would find and interact with compatible Aether to force the results you wanted, but other than this, there was no other way to force the Aether in the surroundings to become the exact sort of Aether you wanted.