I think Terence Newman can take care of Andre Johnson, too.
When Johnson goes over to Newman's side, probably to run a screen, smoke route, or deep, jump ball, Newman will be ready to meet the challenge.
It will be interesting to see if Dallas has Jenkins shadow Johnson, because they move Johnson all over the field. However, I'm pretty sure Johnson primarily plays of Jenkins' side. I think Phillips might very well do it.
That way Newman can stay on the speed WR attempting to stretch the field.
Plus, Jenkins gets to use his long arms and strength to bump and run with Johnson. Jenkins size and speed is going to cause Andre Johnson a match-up problem.