Yes I will say Indurain. He won the biggest races in the world by demolishing people in this discipline, and he did that over and over again.Half a dozen? Really? Ok, Cancellara... Enquetil who was beating chain smokers who rode with their legs open, and i assume you will say Indurain which is rather funny as he only won 29 out of 100 ITT's he did, while Evenepoel is already at 23 out of 46. Who else?
Coppi, Merckx, Hinault, and Anquetil and Cancellara of course. Maybe Moser too.