If Brad Horder was already gone then why would 20 players not return the next season? It may have been more to do with the Head Coach of the club who couldn't fill 2 teams in 2017 which meant they had to drop out of Massey for the year.
There was a range of reasons. It wasn't because they all backed Horder, most were glad to see Ina step in.
As for Massey there was plenty of drama going on in the background with the board. But I don't think there was a drama with Clarke as far as the players were concerned. The background shit obviously didn't effect the team too bad because despite losing something like 3 of last 4 heading into semis they reached the GF.
Greg Davis and Joel Tubbs left to go play in Wollongong where they were offered better money + less travel, Trent Jennings moved on, Mick Pearsall went to play QCup, Hurd brothers went up to Central Coast, a couple others left with Horder as they were buddies.
Then the following year the club decided to scrap the hobby payments which meant the match payments started getting taxed and all of a sudden with poor recruitment and a drop in matchies, majority moved on.
As someone else mentioned it probably depends on who you ask up at Storey but from what I've been told the biggest blow was the taxing of match payments.