I reckon it'd be a step back in his career if he were to come back to the Nix. It would be far more beneficial for Musa' career and potentially the All Whites in the future for Musa to be trying to get signed in England. There would be plenty of league 2 teams that would definitely consider offering Musa a contract and his agent needs to be pursuing this (assuming he has an agent which he may not). I think it's much better for his development to be playing first team football in say an English league 2 team than sitting on the bench in the a-league.
My 2C..
Agree but perhaps League One
Musa trialed at Hearts in Scotland a month ago but they weren't interested. League One / Two probably his level - he was doing quite well at Hereford in the Conference and cemented a place as starting centre-back before he was struck down by glandular fever in March.
Hereford fans were sort of 50/50 on him: some really liked him, others didn't rate him much...
Has been staying with his parents in Wanganui since playing in the NZ "A" team v Jordan, having a holiday...