It's not like the other four ride every race with him. Juraj for example has only ever started one GT where he quite quickly missed the time limit...
Some people are saying that it was his duty that day
Tour de France 2017 Stage 9 results
Rigoberto Urán is the winner of Tour de France 2017 Stage 9, before Warren Barguil and Chris Froome. Chris Froome was leader in GC.
www.procyclingstats.com