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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.
Homesickness is a bit part of it, isn't it?
Maybe also who.