There was no 'normal' road and GT career path from Cardiff to a Tour de France podium when Thomas was growing up or Wiggins from London, nothing existed like in France, Italy or Spain in terms of a career path to it really until Sky. ANC Halfords really didn't count for much and not all riders want to do a Simpson, Kelly or Millar and basically become another nationality to have a road career internationally in GTs
The point is, physiology uphill or in a GT is really no different than endurance track pursuit physiology and history proves it. Of course you will have to transform if you only had track racing to pay the bills racing Olympic track, there's no choice other than to transform to go and race road!
Well, ACTUALLY, Red Rick, Thomas was good at the 4k pursuit just like Ganna, but Ganna doesn't have that British work ethic and morality to work hard (for 3-4 months a year) and discover how to climb at an elite level when already pushing 30.What are you talking about, Ganna has done way more in the mountains than Thomas before 2015.
You see, nationality is important to road cycling, but in track cycling, nationality has no bearing on success because every nation in the world puts the exact same amount of money into track cycling, so all the great GT winners came from Team Pursuit. Just look at Tadej Pogačar and Jonas Vingegaard's records in the team pursuit - they're absolutely peerless!