Momirovski was the only new signing who didn't have an off-season with the club. He arrived coming off an injury (IIRC?) and had just got married in Australia before settling in Leeds. It's hardly surprising he's in the long list of Aussies who have had disappointing first seasons. Added to that, the guy who signed him left half way through the season and there's been no continuity in wing-centre partnerships on either side of the field all season.
The only outside backs who have come out of the season with any credit are Ash Handley, who has been at the club for years, and a couple of kids. Let's not forget how long it took Handley to establish himself, and many people on here were adamant he would not make it in his first seasons under Brian Mac.
What are Mom's positive attributes? He has good hands, and reads the game well. With a pacey wingman outside him and a destructive backrower on the inside he could be a vital link in a destructive attacking left side. If we are re-building the Murray team, he would be Brad Godden - not flashy, but the ideal winger's centre (sure, he's some way off Godden on this year's form, but the potential is there). He's good under the high ball, has a decent record getting over the try line when he's played, and has a good ability to be in the right place to secure the ball when Leeds are defending their own red zone.
I don't know if he's on the way out or not, but he's surely one that we might expect to be better after an Arthur pre-season.