Ferres is a too class impact backrow forward who can do things nobody in our current backrow can.
Tomkins has the potential to play like Ferres and more but he hasn't done it yet since his return from Union.
I think personally we could comfortably fit Ferres into out squad, allowing us to rotate players and give them all game time.
The potential time for players to be unhappy in with a backrow rotation including Ferres would be in big games and finals but again surely that will only benefit the team in every game.