We cant win a rwc if we dont have a 6 that wins contact & a 2 that struggles over the ball at the breakdown
I think Leota is a real shot for 6 if he makes a good return. Otherwise Gleeson could make his way into the first choice team. Holloway is excellent in the lineout and fine in contact. He's not dominant but he's also not weak.
I don't think Samu makes sense anywhere other than the 20 shirt for his versatility.
Our problem at hooker is that everyone is a compromise. Porecki is potentially the safest option at lineout time which has been a problem in the past. Uelese might be the best over the ball of people actually in contention (I don't think Latu is given he isn't even getting game time for the Tahs) but his lineout is generally pretty poor.