I mean what's an outlier in the first place? If you have ten apples and one orange, that orange is an outlier, while ten oranges wouldn't be outliers. However if you have 1000 apples, those same 10 oranges most definitely would be outliers again.
In other words, if a guy with 30 wins in his career has 15 wins that didn't come from sprints (which is the number of wins listed above) , I wouldn't say the majority of his success comes from sprinting.
However Sagan has a lot more wins than just 30. And while those 15 wins listed above are ineed impressive you definitely wouldn't put him in this conversation only because of them. He is in this conversation because he undoubtedly has the clear advantage over froome in terms of quantity of wins. And so if you look at quantity there is no way to get around that for Sagan, non sprint wins are more or less outliers.