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That's just how GT's work, gravel or no gravel. Froome ultimately only won the 2015 Tour due to time gained on Quintana in crosswinds on stage 2. 
In this particular case, it's pretty lame how decisive that one stupid crash by Lucas Hamilton turned out to be: it ruined the race for Ayuso and Roglic and put Del Toro in pole position for the rest of the race. But them's the breaks, GT's are meant to test riders in different kinds of terrains and not just mountains.