I feel like Green is honest with them. They just lack pretty much any form of confidence.
For me, lack of confidence explains not finishing on their chances or playing as individuals instead of a team game. Does trying to win create too much pressure for them? If yes, then they're in Sabres territory.
Lack of situational awareness (nice way of saying being dumb) is also a huge issue IMO. Explains TMM penalties, line change issues, being scored on early/late in a period or right after they score.
Will be next to impossible to get out of their funk if they're not ready to continue doing the work like they did at the beginning of the season.