Having Democratic congressmen that are essentially Republican won't help the Republicans win the house.
No, but the Democrats holding the house by virtue of a few Blue Dogs who always vote with the GOP on anything important won't make the Democrats look too amazing either.
Yes, that would be a disastrous outcome for the Dems, although I don't think of Ross as one of the Dems who would truly make us look bad, since I assume he'd still support Pelosi for speaker. Having a majority consisting of Boren, Taylor, Minnick, and Bright and maybe a very scared and overreacting Barrow would be ugly.