Obviously indirectly related to the Rapids ... Thanks to Craig: http://www.playerpress.com/articles/7421-are-the-denver-broncos-for-sale
The NFL has rules regarding cross-ownership. The cross-ownership rule reads as follows: "No person who owns a majority interest in, or has direct or indirect operating control of an NFL member club, may own or acquire any interest in a club in another major team sport (baseball, basketball, hockey), except for a club located in: a.) his/her NFL club's home city, or b.) a non-NFL city that is not a potential NFL city." So it looks like it could be legal at least.
I would think if Kroenke was to sell his part of the Rams that he would use that money towards Arsenal before he would go for the Broncos.