The Cheetahs have some advantages. 1. They start their season earlier and then come up against pro14 teams who are not match fit. 2. They play at altitude which gives them a natural advantage especially combined with the first point. 3. The other pro14 sides missed their internationals a lot of the time. 4. The other pro14 sides have European matches throughout the season along with international matches. It's not like for like when you compare super rugby to the pro14.