They've been together a long time now. Not all teams need to be together from the time they were kids. That's not the history of most teams.
Oh I didn't say it was nice! Just not hater!
but curiously enough is the story of practically all the top team now competing... ah and by the way nikita is 22 so he following your stement about D/W he shuld be starting to get to the top now or in the next year or so, so far with all of that medals he has already done too much... and old Elena is already 19 so she has at least 4 years to go before you can even ask her to take home some succes