On reflection - of you look at the best seasons of riders like Merckx, Maertens and Kelly - they were winning every month of the season, with maybe a three or four week spell out of racing in there somewhere. Maybe we need to take into account that our illustrious Tadej has fewer race days - his palmares give the impression of a higher win rate but is by being more targeted.The multi-terrain ability is less worrying to me than the constant on-form status...
None of this helps with the question of whether he rides clean or not, but more to emphasize that his exploits are not unprecedented in cycling - albeit you have look back a bit further in time. Of course, saying he sits comfortably at the high table has connotations of how that is achieved...