At the end of OoT, Link was sent back in time before anything in OoT ever happened. Ganondorf was prosecuted and Link went off adventuring. This is where the " split timeline " theory comes from.
I think the reason most people look the same is because of copy pasta, but if you wanna get technical they never met Link.
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Brawl is like ZSS' breasts. Well rounded for casual players.
http://i53.tinypic.com/28sxzzr.jpg