Disagree on LT and FB. First, okung started 7 games and didn't finish 2 of those. Trent Scott started the majority if the remaining 9, hard to say its a downgrade, if anything its lateral.
For FB, thats a downgrade. Armah was a beast at FB, problem is its a dying position. I do think tremble will be good, but from the FB position, he won't be armah good.