It's hard to explain. It did lead to me thinking that Olimar was going to be in Brawl, though he wound up at a different icon number than expected (which leads me to think he was added later in development).
Early on in the icon theory days it did allow me to be completely confident that characters like Marth, Ness, Ice Climbers and Mr. Game & Watch would be returning, though. So I guess it sort of succeeded.
What's completely dumb is that PictoChat and Electroplankton each get unique icons, which seems like a waste. Just imagine the speculation if we had seen the Electroplankton stage (and icon) earlier in the life of the Dojo, though.