I've been hot and cold on Anderson throughout his UFC career but there's no doubt, he's the most devastating fighter to ever walk the planet. He's incredible to watch and will always have a top HL reel. That video was great and it didn't even have the Belfort KO.
I think at this point the only thing that improves his legacy would be superfights. GSP is a good start, but a fight with a LHW such as Rampage or Shogun would be icing on the cake.