No, I've gone flawless but it isn't a necessary thing to "become legend". It just means you have a thorn or red death as well as a somewhat competent team. Id be willing to agree with a certain amount of trials wins being one of the things, but with all the cheaters and cheap tactics used to achieve 9-0 it would merely frustrate most players who are a valued part of the year one community. Besides we already have our 9-0 snowflake emblem.