It's because aLttP was a prequel to the first two games. It was a 'link to the past' of the first games.

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My granpa has a GC, SNES, and NES and I have no game console at all. Weird, huh? PM me for the full story. On his GC I have Super Smash Brothers Melee, WW, TP, and Zelda Collector's edition. On the SNES, I have aLttP, Super Mario World, and a few other games Rampart, Lagoon, and Vegas Stakes. On the NES , I have (sold LoZ), AoL, Mario Brothers, Mario Brothers 3, some other game I can't remember, and the duck shooting game. The SNES and NES games were bought before I was born! I love my Grandpa.