Lindland's last fight vs Van Arsdale was at 205 also, so this isn't his 1st fight in that weight class.
As far as the Rampage vs Lindland fight goes, it really could have gone either way. Lindland had Rampage fighting at his pace most of the fight. He had him tied up in the clinch and defending a few submission attempts.
Rampage used his power and aggression to win the fight. A lesser man would have tapped from some of those submission attempts.