If we can’t retain Tamou there’s no reason to think Hetherington will be playing regular first grade. He was sixth in the prop rotation this year, he’ll likely only get game time if there’s an injury.
I’m simply saying IMO that I believe Jack can do the job that Tamou currently does and given Jacks age, potential etc maybe even better. At the end of the day, it is up to Jack I guess, if he stays and Tamou leaves.