Nah it's because Denver requested help from the DEA with their illegal grow problem...the guys that got popped either had been reported multiple times to police, had the most evidence against them, or royally pissed off the IRS.
This is just the beginning- I heard sometime last year there were 60 known warehouse grows in Denver that were unlicensed but that the city doesn't have the resources to pursue unless they can indict them federally. I've been saying it for a while...2016 is an election year the Feds are out for their money