Ultor was put into Saints Row as a reference to Red Faction originally, but then was kept as an antagonistic force in SR2 because they fit for what Volition wanted for the plot, and then was only kept around afterwards since the corporation became fully ingrained into the Saints Row universe. On the flipside, there's an easter egg in Red Faction: Guerrilla making reference to SR2 in the form of an audio log of Shaundi. Volition has stated multiple times that while they've made subtle jabs and references to the two series in their respective games, they are not connected in any way, shape or form. Also, as I've stated before: with the earth getting blown to hell in SRIV and Volition no longer owning or working on the Red Faction series(that's Nordic Games now), there are no more connections between the two series.