He is just a really good rider. I don't think he can reach mutant level but he is still improving and his preperation until Catalunya didn't went well. He is improving through racing and staying healthy at the moment. Catalunya, Basque and now Romandie is a really hard shedule, but he likes it as a rider who doesn't fatique much compared to other riders. With a perfect prep he can be near the mutants in week three the TDF.
Perhaps he can win in Slovenia against normal riders. His kick and shorts effort has improved a bit I think.