I have actually raised them all the way maxxed up. They even had their 1* tourney which was cancelled later 🤣🤣😌 Now they can be placed in the (game) Museum and earn ourselves a few gems.
I am currently maxxing this boy. Perhaps after him when I don't have other heroes to upgrade, I would consider those to earn gems from the Museum. I got this boy from the most recent Soul Exchange. My Hero Academy is still training all troops. Until the next Elite troop conversion then I wod consider re-training the Legendaries and see the stat.
These Elite troops earn me the most Bonus Points in Alliance War although my heroes are much inferior to that of the other player in the ally I am currently in.