Exactly this. Herman was good as an impact forward off the bench, and reasonable as a starter when the season began, but declined in production and effectiveness as the season progressed. Of course his youth counts for something, and he'll no doubt become a solid more consistent first grader.
Ofa got silly last year (youth) and paid the price, but is the better of the two in my opinion, and is starting to show his wares. He may not run at the line as spectacularly as Ese2, but he will do the 1%'s and take the tough runs when no one else wants to.
To top it off, Joe is a bigger body and a year younger too!
Ofa, TPJ and Su'a are the forwards of the young crop I don't want to lose. The rest, while handy, especially Arrow and Ese, are not as essential imo, but will probably find their way to other NRL teams, and forge a career there...
I don't begrudge them in any way, and wish them the best.