I dont think he needs training wheels, but you have to consider a couple of things...
About hitting the deck, still cant understand why he was in the front of the group in the last km for example, if the DS told him to do that the days he hit the deck then the guys screwed up big time. My best guess is that they were trying to get some bonus time in the sprints because there is no more explanation for being in the front in the last km. Either way is a pretty idiotic strategy because there are guys that are pure sprinters in the race and no way TP was going to win them. So far I would congratulate BMC DS for making him go to the front of the peloton in the worse moments... dih dih diiiiiii!!! and one extra for himself maybe for listening or doing it not only once but twice.
About the accident in the TTT, well... injured, he did not know the road and those bikes are hard to handle, one mistake and you end in a ditch. U can tell he handles the bike, not anybody would have saved the bike how he did.