Foggy, I'm sorry that's not spelled out exactly in The Rules. Your assumption is correct, no killing two birds with one stone. The under 1 mil and the '4' defender are mutually exclusive.
Other tidbits - You can have as many '4' ranges as you want over the two required, and a '5' range counts as a '4', IOW '4' or worse.
Arryl is also e-mailing me his pick in a few.