I think Barrett is worrying too much and is developing an inflexible mindset about where he positions players. I remember a few top coaches in the past saying you pick the best 13 players and then you worry about their position on the field. Though I think this is an over simplification...would you pick 13 backs for example?...I think there is some truth regarding a degree of flexibility concerning where you position a player.
There are several examples of this inflexibility that we're seeing with Barrett's selections. He has Hastings playing out of his skin as a bench player, but he only selects him at hooker, when at the Roosters he quite competently played in the halves. Api is a hooker and doesnt have the same overall skills that suit a 5/8, yet he places Api at 5/8 when Croker is off, and Hastings at hooker. I know he wants to give Api a breather and probably rightly so. But he's had many opportunities to play Hastings in the halves, where he has succeeded, and yet he wont budge.
The same applies in the backs. He has Matt Wright pigeon holed for wing or full back. Jonno Wright wing only. Both are not first grade material or at best are fair first graders. Yet he has speedster Tom Wright, who he had in his extended squad only 2 weeks ago, not being considered on the wing for this game, despite having played wing and full back in the past. It almost feels like he's pigeon holed him for 5/8 or maybe centre and nothing else. Parker is competent as centre but nothing special, but you can see he would make an excellent bench player for backs and forwards, yet no movements in the direction. Then we have another speedster in Anderson, a developmental player, who has played all his career at full back or wing, and not even a mention
Barrett seems to me to be in a mind set, probably based on fear, that you use players in positions they play the most even if they are only safe and offer no inspiration. I would have Hastings on for example for most of the match. He's a terrier. I would have Tom Wright on one wing at least. He has speed and creativity. If Tom T is out I would have Anderson at full back. He always looks strong and confident in that position. Barrett needs to start looking outside the box. He's killing DCE when TT is out because other than Kelly (and Walker when he's fit) he is the only inspiration for attack out wide in the side. Close him down and you close Manly down.