You shouldn't do starters with dry yeast. Their cell counts are already high enough. The instructions are for rehydrating the yeast, which is good to do with beers over OG 1.060. You can rehydrate any dry yeast per the manufacturer's instructions, but you can also sprinkle the dry yeast on top of the wort after aerating for lower-gravity brews. I've done it both ways and it works both ways. For lower-gravity beers, it's more convenient to just pitch IMHO.
Starters are for liquid yeast, as the cell counts are significantly lower than those in dry yeast packs.
Primary 1: 4 Hop IPA
Primary 2: Apfelwein
Primary 3: Air
Bottled: Hammered Squirrel Nut Brown Ale (btl. 5/9/10), Jamil's Evil Twin (btl. 3/29/10), Crazy Ivan RIS (btl. 2/14/10), English Pale Ale (btl. 12/29/09), Apfelwein