How come Eddie Guerrero came out the main entrance in the Low Rida?

Most likely because Smackdown had a very different stage set back than compared to today's current stage set. Smackdown over the years have had several stage changes since the days where it had the classic fist in top of the stage entrance. So that could be the reason as to why Alberto Del Rio enters the stage differently. As far as Eddie Guerrero goes, yeah I definitely miss Latino Heat. He was classic, always entertaining making Smackdown so fun to watch back in 2002-2005.