I don't believe it did. I understand the argument, we were 3 from 6 when Galvin hit the news, which was obviously better than the seasons winning percentage.
But, we still won 2 from 5 during the ordeal. That would suggest they did have the ability to push the rubbish to the side and play on.
I think limited depth derailed the season as players lost form, with no-one capable to replace them. Hunt, Pole and Toa the obvious offenders (perhaps due to injury).
Could argue the Galvin stuff played a role given we had games with Mason at 6 but Doueihi was available in those games. That is poor team selections more than anything else.
I think the season followed the typical path of the players interest levels fell off when the finals hopes started slipping. This was about the same time that Galvin left the club but Id say the timing is coincidental. It's been the same the last few years for us and common for most struggling clubs most years.