His sprint sucks. Will probably be more of a TTer/stage racer.What type of rider is he outside of TTs? Is he the type that can develop more into a sprinter or can he climb at all to be a decent GT or stage race rider or will he mainly remain a TT specialist in the style of someone like Tony Martin?
Alla Ineos c'è già l'erede di Ganna: si chiama Tarling
Dario Cioni presenta Joshua Tarling, cronoman di 19 anni. Sta crescendo nel'ombra di Ganna, ma vincendo l'europeo ha già fatto vedere di cosa è capace
bici.pro
This interview with his (and Ganna's) coach gives a good overview.
TLDR, Tarling currently is very interested in reciveing advise from other pros but has some weaknesses:
For one he apparently is not the best at training accurately. Currently for a pro trains a very low volume, something that will be changed over the coming off-season, likely partly that is responsible for his poor fatigue resistance.
Tarling is only 78KG already (he has not much muscle, kinda like a really big early Dumoulin) but can drop weight in the coming years, so may be able to become a GC rider in the one week races or potentially GTs in the future. He may go back to the track for the Paris Olympics, if he does, he'll be in TDU next season so he can do the track world cup there.
My personal opinion is that he probably will struggle to get selected, Tarling owing to his lack of explosivity is an extremely poor pursuiter compared to his TT skills (not that he's bad, just nothing special).