Adam Yates. Yes, he's progressing nicely and I think he'll reach the point where he'll be able to attack and go for the win rather than hang on for dear life
Esteban Chaves. No, his TT is a handicap, and I don't think he'll ever dominate the climbs in a GT.
Miguel Angel Lopez. Yes, he road great in Suisse and I think he's too young to be very close to his ceiling
Mikel Landa. Probably. His peak is certainly high enough. His problem is he seems very vulnerable, and Wout Poels also wants to lead a GT next year. Might make things more complicated for Landa, because if he doesn't deliver next season, I doubt he'll lead a GT at Sky in 2018 should he stay there
Rafal Majka. No. Simply not good enough. Unless he improves it's not gonna happen. Top 5 material in Giro and Vuelta and top 8 material in a Tour, but nothing more. Should probably be riding one GT for GC and one for stages every year.
Richie Porte. No. It seems he rather podium'd the Tour than win a Giro or Vuelta. On his best days he has the level to win a Giro or Vuelta, but he's too inconsistent, vulnerable and Tour-centric to pull it off
Romain Bardet. Maybe. Made a nice step this year. Very good descender though still bad tt'er. Right now I'd say he could maybe win a Giro in a perfect storm, if he improves a bit more that perfect storm won't be as necessary. I never see him reach the level to win the Tour though
Steven Kruijswijk. This hurts. Has shown he can win. Unless he improves even further, the Giro is the only option
Thibaut Pinot. Hasn't improved one bit where it matters since 2014. Can't climb with the elites, so won't win.
Tom Dumoulin. In the Giro stage to Roccaraso he showed that the Vuelta wasn't a one-off. It still was a perfect storm to win. He can limit his losses well, and take minutes in a good TT. Still, he benefited from flying under the radar. He can't win if the top climbers in a GT just fly away from him every mountain stage. The more aggressive the race, the better he would basically need to be. 2015 Vuelta Dumoulin could win when a miracle happens. However, I believe he's got room to improve his climbing yet. If that happens, it makes all the scenario's more beneficial for him. However, I am in dubio about which GT he should win. Right now, miracle Vuelta seems the only option, but if he improves his climbing I think a Giro is possible as well. For the Tour he'd basically have to become of the best climbers in the world whilst maintaining his TT edge. Losing weight and improving TT's, I think I've heard similar stories
