I actually like what I saw from Irving. It was not perfect, but I saw some great play to go along with some not-so-good play, but I think its more a matter of him learning that position than not having the ability. Remember, he got very little coaching in college and played most inside for us last year. Its a big adjustment, but I think he has the tools.
He reminds me a lot of DLaw when he was learning LDE last year. It takes a while, but I suspect he will end up being like DLaw last year, struggling early and then becoming very good later.
I don't think Russell is a RDE at all. Not explosive enough, not athletic enough, not enough bend, etc. etc. He just doesn't have the tools. His ceiling is Mincey from '14. I think he might make a decent LDE.
I am hoping that Mayowa can hold the fort at RDE until DLaw comes back and I think he comes back as the RDE.