Comparisations...Zabriskie, van Garderen or Leipheimer? I will go with Bobby Julich. Good enough climber to get some GT results onTT heavy routes early in his career. Not a future GC winner. Will probably be among the 3-5 best TT specialists for at least 5-10 years. Will be interesting to see if he can make the Dumoulin/Wiggins transformation and improve his climbing or if he will go the Julich/Martin route and focus on TTs.
Don't mean to be a jerk or a party pooper, but... remain realistic.
It is not probable for him at all to be one of the 3-5 best TT specialist, let alone for the next 5-10 years even if he manages. Today was a strong performance but you seem to read into it too much. First of all, this was a short ITT. Second of all, this was a very atypical ITT. And lastly, some of the biggest TT guns were not here. No Evenepoel, no van Aert, no Ganna, no Dennis...
Beating/rivaling Roglic once also doesn't mean as much as you might think it does. Campenaerts has beaten Roglic, Bernal has beaten Roglic, Dumoulin, Thomas, van Aert, Pogacar, Van Emden, Ganna, Kwiatkowski, Evenepoel, Kangert, Porte, Dowsett, Oliveira, Bevin... have all beaten Roglic. And i'm not talking about 6 years ago, i'm talking about the last 3 or so years. Only last month he was beaten by Bissegger and Cavagna. And most of the big hitters aren't that much older, or even younger. He's a great rider, he'll definitely be in the mix and win his share of races, but i'd remain cautious with lofty expectations, even if he still can improve.