Chris, I think you are right on with this.
I think that he liked the shiny new building.
He may or may not have appreciated the benefits of what Kisshomaru was doing (that story certainly suggests it), but that doesn't mean that he had any interest in the organization itself.
His massive lack of interest in organizations at any level has been mentioned by many of the uchi-deshi.
That's why I'm saying that calling it "the Founder's organization" is probably less accurate than calling it "Kisshomaru's organization".