Even if it's not for GC seals, they have the right to greed on it as much as anyone who is not on the job. Still brings me to my stance of if you want the weapon that badly then go on that specific job or get the 10 totems if it's byakko. It doesn't really matter what the person wants with it, especially if you are in a random party. I would get it if it was a savage party or end tier but something like a trial i don't see it mattering.