8 and 17 is a significant difference especially as it pertains to hockey players, and even more especially when Mikita never played hockey before setting foot in Canada. Also that Mikita became a Canadian citizen and was likely not a Czech/Slovakian citizen ever again, while I would assume that Draisaitl remains a German citizen even if he attains/attained Canadian citizenship. Mikita is relevant though in that he is very likely the correct answer if he is eligible, while Draisaitl is the answer if he is not.
It's a weird discussion in that Mikita has pretty consistently been considered a Canadian player yet some are acting as if that belief is instead the uncommon one. The reasons given for Mikita being a Slovakian player only would lead me to believe that the same people consider say, Owen Nolan not a Canadian player but rather a Northern Irish hockey player and one of the greatest European power forwards of all time. Both born outside of Canada to parents not from Canada, both played for Canada and spent all of their development time in Canada and were citizens of Canada. Good old European star Owen Nolan.