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Theautisticrebel 
I personally disagree with this by I’m glad unlike other interpretations of this idea it acknowledged the age difference between Clear Sky and Wind Rider and the way they got together was pretty believable but I still have a few problems
1 if Tornado Blitz was one of the wonderbolts seen in “The last problem” then wouldn’t he probably be at most Wind Sprint’s twin brother considering the time skip?
2 It was confirmed that Wind Rider isn’t Wind Sprint’s father
3 even if it wasn’t debunked and the episode didn’t give us any hints that Wind Sprint’s father died Lightning Dust still doesn’t look like Clear Sky’s daughter and if it were to be true she would probably be her half-sister rather than full sister
4 I don’t care what Patton Oswald says since he only voiced a character that appeared twice Wind Sprint’s father was heavily implied to be dead