Lol, context CLEARLY shows that Minato is superior to Oro.
It really doesn't. They had NO information on Orochimaru's abilities, considering they didn't know about his regeneration, Edo-Tensei, his research etc. Plus, Hiruzen said, "No one can stand against him", with Anko making her statement. Implying, only Minato can go, toe to toe with Orochimaru. It's really basic, it's called perspective. It's like, Itachi saying you need Amateratsu and Tsykuyomi to unlock Susano'o, yet Madara and Obito don't have it. That was his opinion and perspective, it's basically what he THOUGHT you needed. Dismissed.