No.

ok thanks I will start mixing them up in battles....

That's not what I said. Just because they are legendary, doesn't mean you should use them. I have tons of legos that sit in my vault.

You shouldn't get rid of them because 1) they may become useful in the future (hello Nogdar!), and 2) faction guardians are very useful.

ok now I understand...Im not a newbie, but still learning every day

WM