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During the Tour there was a lot of discussion about how his form had improved hugely since he'd moved back to Brittany, but I think it had maybe put him at odds with his team a bit.
Fortuneo-Oscaro are based there so he's going to be by far the biggest name in a home-town, home-country team, who can achieve their main objectives of publicity, stage wins and GT invitations.
At Sunweb, he'd be away from home, below a few GT contenders/sprinters in the pecking order, and expected to work for others, which he clearly doesn't enjoy much.
Homesick from where? He lives in france.
Think as andy said, he just want's to be his own man. Not the teams man.