DFA123 said:
Not sure why so much negativity towards Jungels chances. If Thomas, Dumoulin, Roglic, Froome etc... can transform themselves into some of the best stage racers in the world then Jungels certainly can - he's shown as much talent as all of the above from a young age.
Given the way the type of rider that challenges for GTs has evolved in the last couple of years, it would be criminal not to give Jungels every chance to fulfil his potential as one.
Every example you give did much better when they first really led a GT than Jungels did in 3 attempts by a big margin, and it's not like his results in smaller stage races suggest he has the makings of a top GC rider either, with his lone podium in a WT stage race being the infamous 2016 Tirreno Adriatico, after well known GC prodigies Greg van Avermaet and Peter Sagan.
He tried to go for GC in the Tour last year and his best result in a mountain stage was 11th in a stage where he started the final climb with minutes of advantage on the main GC group and finished almost 2 minutes down.
ITTs matter much less around 10th place on GC then at the very top. He can easily drop 15 minutes to a superior climber over 3 weeks and he might take like 2 minutes back, not to mention that all of the guys mentioned are superior TT'ers in the first place.