Wait isn't ET the rank after legend?
The only way that idea would work would be if they released a large amount of weapons to every class or had a shop that gave special weapons for ranks.
Stefan would never go for it because there are no benefits to them to give us weapons for rank instead of for gelats. It would be nice to have some more incentives for reaching every rank level, but it seems like an awful lot of work for something that ultimately wouldn't happen.
I'm not trying to be pessimistic or anything, but why would they just release a weapon for almost no reason at all when they can get money out of it by putting it in the gelat shop?