The 5 players I mentioned have all played tier internationals or origin with the exception of Nofoaluma who was a former Dally M winger. 2 of those players (Nof and JOf) have won the clubs player of the year, so proven they can perform here. I can certainly understand the viewpoint that they weren't necessarily quality players during Marshall's time here, but they clearly have proven to be quality when correctly managed.
I suspect only Nofoaluma has individual issues bigger than any coach could overcome at the time he was moved on. He is also the only one that I believe fits the description of previous coaches failing to address performance. Of the other 4 JOf was our player of the year in 22 the year before Marshall (and Sheens) took over and Utoikamanu played his Origin game in 23, Marshall's (and Sheens) first year. The other 2 weren't here prior to 23 to have performance issues under other coaches.
Yes they weren't playing particularly well here but is it not on the coach to get the best out of them?
Yes, moving on these under performers may result in a better squad. The hope is that the new improved squad being 'his squad' will mean he is better placed to get the best out of them.
The major concern for me is if he couldn't get those guys to perform well why will he get the new and improved squad to perform well?