Doueihi's biggest problem is himself. He wants to be a ball playing organising 6. Gee, the guy even said 6 or 7, how on earth can he think he could play 7?
Until he realises he is a runner first, no matter where plays he is no chance of succeeding. Run run run, and I'm sure his ball playing will improve off the back of that. He is definitely a player that is getting in his own way and costing himself badly. He needs some stern words from the coaching staff and also probably from someone outside the club that is respected to make him realise what he wants to be and what he can be are 2 different things.
As for fullback, I'm more open minded then others. I'm not saying for a second you can put him in the Tommy Turbo category, but watching Tom dominates running at half pace makes me think Doueihi can be effective if he has the right attitude. AD purely thinking "I'm going to play physical in everything I do" will not only play to the strength of his running game, it could really unlock him. But it has to come from within him.
He doesn't deserve to stay in the team, but he will, so I think fullback is worth a shot again provided his assignment is clear....run run run.