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A Quickstep move would be the death of his GC ambitions. I mean he can have a crack but he won't get much support, like Dan Martin didn't when he was there.
It depends on his motiviation. It was telling that at the end of his career Wiggins simply couldn't be arsed to put the work in to be in the form to win three-week races. If Thomas is like him and likes to keep moving on and ticking off new achievements then a move away from Sky would make sense, especially if he does want a proper tilt at the classics.
Interesting thought from Rouleur