Colorado has one of the better, most updated voter files in the country because they are regularly matched against people who file change of address forms, death certificates, felony convictions and other ongoing updates. A federally centralized list would likely be more susceptible to hacking and alteration. The commission is just going to match them to immigration and other databases, but they don't have enough information from Colorado files to make accurate matches, so they'll just claim there's voter fraud. That's what Kobach always does - it's dishonest.