The game today for me confirmed that isaako is very unlikely to be an nrl fullback. Although his defensive positioning has improved, he was caught out in Rowe's try, but the major thing is his lack of involvement in attack.
He had the most top grade experience in the team but did not stand up when souths needed it. Yes he got a try assist but what I noticed was that he only ever involves himself in a play or supports a ball carrier is when the play means he gets the ball.
Unlike top grade fullbacks he never just supports ball carriers in case of an offload, never runs decoys or just maintain a presence around the ball. Because he only gets near the ball when he was going to receive it, it was telegraphed and he was mostly easily covered by the defence and by not running decoys or support he did not attract the defence and therefore did not provide opportunities for his team mates.
He has had the opportunity to acquire this skill across 4 years in reserve and top grade now but is still lacking. For me, in top grade he is a wing or nothing now.