Sean Long no coaching experience?
How about Salford, Samoa, St Helens, Hatlequins - albeit Rugby Unuon - now at Leeds Rhinos and has also been appointed as The French assistant coach for the World Cup , all since retiring from playing in 2011.
It does seem like you are struggling to come up with any likely candidates judging by the list you have put together, go on then I will put you on the spot what is your 1,2, 3, from your list?

Just been told Lewis Bienek has been released by Cas , he didn’t get much of a chance to show what he can do at Cas , but when he was at Leigh I thought he did very well, he’s a young hungry forward , maybe worth giving a chance to next season .

Definitely the type of player we should be looking at recruiting for next season. Also the likes of Olly Ashall-Bott, Will Dagger, Nathan Roebuck, Chris Hankinson, Jack Logan, Josh Eaves and Eribe Doro are without contracts next season.

All young players with potential who would thrive with the opportunity of regular first team rugby IMO.

All decent young players , it all now depends on the New Coach , whoever he may be , I will chuck in a name for the Director of Rugby , Ian Blease currently at Salford .

Seems Michael Maguires future as Head Coach of West Tiger's could be up in the air.

I have heard all sorts of rumours this season regarding the Head Coach job at Leigh from Henderson approached & doesn't want it to Shaun Wane offered £250K to see the season out around time that Duffy left).

Bearing in mind I have absolutely zero connections inside the club & don't know how true or untrue any of the above was, I would prefer the club to go for a Maguire, or Henderson or Briers & hopefully no Ex Leigh players or coaches.

Somebody is making the calls on who to keep. Pretty sure it’s none of the above.