I worry about not having a ball player at fullback. Given that you want both wingers to be strong carrying the ball, having DWZ at fullback means the back 3 are the same type. I haven't seen anything from DWZ that makes me think he can provide another passing option.
IMO, it seems the better teams in the comp have fullbacks that can run and pass i.e. Coote, Boyd, Barba. I see DWZ as a Dugan-style fullback which I think would send our attack backwards.
I'd like to see Moylan go to 5/8 but think we need to bring in a guy that can still provide a passing option. Maybe TMM is that guy.
You mistakenly lumped the Broncos in with the better teams. Broncos are shit and sliding down the ladder.
The better teams have two good halves that are quality and compliment each other. They also have fullbacks who have more then just ball playing up there sleeve. But the halves are the more important part of their success.
Cowboys - Morgan and Thurston... Morgan was fullback before being moved to halves. Thurston is a future immortal. Coote is probably the only example that is close to Moylan... and if he didn't have Origin players in the halves he would likely be there aswell.
Sharks - Maloney and Townsend... Maloney the best NSW half. Townsend being a perfect partner for him. Barba has speed and elusiveness. He has sucked the past 3 years because he lost his ability to use it. Gets that back and his ball running is killing teams.
Storm - Cronk who is one of the best 7s in in the comp. Green is just a solid partner for him which is all they have ever needed. Munster is a dynamic ball runner with strength and speed. They lost the best fullback in the world and look no worse without Slater. If anything a younger guy with more speed and strength has made them even more dangerous.
Raiders - Sezer and Austin who are both solid experienced halves. Wighton is a fullback who has no brains at all but is just big and tough. Hell not long ago many questioned if he was even a first grader. Some probably still do.
The only team in the top 4 with a similar fullback to us is the Cowboys... but they have the best halves pairing in the competition and would be top 4 whether they had Dugan or Moylan at fullback.
Moylan is arguably more skilled then any of those players. But they all have greater strengths then him as a fullback. Faster and/or stronger. Better support play etc.
Moylan gets the job done at fullback. But he has weaknesses there that arent an issue in the halves. we saw that at the highest level he has played. In his first proper halves match he performed better then his 2 games in the position he has played his first grade career in. Because it removed his big weaknesses and allowed him to focus on his strengths. He was still flawed but it was a great start to build on.