Jean-Marie Dedecker (not the most trustworthy man in Belgium, but still) came with a different explanation next to the reason being De Fauw couldn't get over Galvez' death.
He claims De Fauw was was spat out by other riders and teams after he made a testimony in the case against Quick-Step. According to Dedecker De Fauw got depressed when he couldn't find a new team. Dedecker tried to get him a contract at Topsport Vlaanderen, but even they didn't take them and this seems to really upset Dedecker.
If true it puts the case in a different perspective.