If you guys are referring to the sword pose. It's way-way back to Gundam series.
Silly kid. Anything that Obari touches will have this style. Not that you're wrong, though, but that pose has been around since the 1980s - long before SEED
Brave Perspective / Brave Stance / Sunrise stance originated in early 90s anime Brave Exkaiser and then turned into a popular theme in plenty of Surise's mecha series, and then into a meme.