They “estimated” for the ones they missed. The districts have already been allotted. They will get re-allotted again in 2020.
Some Iillegal aliens are already voting, but giving them “legal status” will, inevitably, lead to “a path to citizenship” followed by Democrat landslides as far as the eye can see. Dunno how the ‘Pubbies miss this. Oh, well. It’s the Stupid Party.