It's funny, I mean you could compare e.g. Contadors two years leading up to winning his first Tour de France and what races he did well in to Thomas & Wiggins 2 years as well, yet they really are very evenly matched in terms of the success rate in bigger races over those 2 years, so i'm not sure a professionals palamares means much in all cases anyway between a conventional continental pro's path to World tour or a track riders path to World tour and winning its biggest race? Not sure. Yes Contador will arguably have losts of differences before World Tour successses, but then it suggests they don't really carry though to meaning anything at World Tour level perhaps other than winning your first Tour much more quickly? Obviously the main difference is Contador came straight into World Tour and won first Tour in less than 5 years, Wiggins and Thomas in 10 years, but then Contador wasn't a domestique, so v.difficult to compare anyway.
Wiggins 2010 to 2012: Critérium du Dauphiné 1st, Vuelta a España 3rd, Paris–Nice 3rd, Tour de France 1st
Thomas 2016 - 2018: Paris–Nice 1st, Volta ao Algarve 1st, Tour of the Alps 1st, Tirreno–Adriatico 5th, Critérium du Dauphiné 1st, Tirreno–Adriatico 3rd, Tour de France 1st
Contador 2005 - 2007: Tour of the Basque Country 1st, Tour de Romandie 4th, Paris–Nice 1st, Vuelta a Castilla y León 1st, Tour de France 1st