I don't know who you are referring to Hani but I'll assume you're referring to my doubts about his defence as a fullback.
As I said before, I'm fine with his defence at the moment in the line and while he'll miss a few at least he's trying and doing the best he can. Again, he'll get help from those around him when he needs it and he's not overly exposed.
However at fullback you are exposed. You can get found out and you have to be strong in defence. You constantly have to put your head where no one else will, you constantly have to be brave in defence and strong holding up giant forwards or strong backs to save tries. By yourself! Without help from those around you.
I'm not bagging Barba's defence as a 5/8th. He's doing well enough. I just have HUGE doubts as to whether he would be a solid enough last line of defence. I can't see that working.
IMO he should have been given a run at 5/8th ages ago, it's about time he has and he's a 5/8th IMO. I don't know why we signed Keating (who I rate) when we didn't even give our own kid a chance who we just re-signed in his preferred and most natural position. Now we might have to force Barba to fullback just out of necessity because we have to try and fit everyone in.