Too be honest, I have pushed for tapuai inclusions in squads very hard on this board.
I watched the Force match again on the weekend, and his defense reads were not great. He is also not terribly combative at the defensive line, ie he gets into correct position and tackles with good technique, but often gets beaten in contact. Still a good backup, however if I were picking the side I would prefer Harris.
Regarding fullback, Harris looked lost when he played there. I would love Lucas to be back and fit, however we do not lose that much with Jono at the back. They are both strong defenders, Lucas is probably better at the breakdown but Jono is far stronger in contact and a better ball carrier, while also being able to distribute. Don't get me wrong Lucas is fantastic, but we don't lose much with Jono fit and healthy.