Geoff Baker of the Seattle Times backed up his article last week on the arena locations with this piece on potential NHL ownership groups in Seattle. Long story short, there appears to be 3 potential groups roughly aligned to the 3 sites.
I created this handy dandy diagram to make sense of it all. Tod Leiweke and Thomas Tull were mentioned in the article as being part of the ownership groups but that seemed more speculative in nature which is why I did not include them in the diagram.
One last shameless plug, I am trying to get 100 people to donate $10 to the RMHC of Seattle just so I can donate $1500. Please consider donating. I am up to $410.