Sagan’s tactics today were spot on IMO. If Cannondale don’t chase the break wins, so they chase. In the finale he had to follow moves else they would have slipped of the front without him, he didn’t force the move, just followed Kwiatkowski.
This left him in the winning move, can’t ask more than that, he gave himself a chance.
But when it was 4 he did all he could do. Sometimes in cycling you have to be willing to lose in order to win. If he’d chased down every break he would have been mugged finally so he was right to ask others to close gaps. It will pay off next time he is in a break when people may be less willing to call his bluff.
If he had a stronger team then maybe he would have been able to sit in and let his team close gaps in the run in but he doesn’t and other teams won’t do the work if he is there.
Cancellara had this issue a few years ago in the classics. He was so strong that everyone would look at him to close every gap, so he refused to chase and now people don’t call his bluff so much. Now he wins sprints from small groups instead of either being forced to chase every attack or go solo from a long way out.