Looks like the texans found their OC-in-training coach, with
Marc Lubick.
McNair noted in his recent interview that he likes that Kubiak consistently improves his coaching staff year to year. Kubiak's ability to work with highly experienced coaches as well as young up-and-comers can provide a 'next man up' mentality that will help sustain success.
My guess is that Greg Knapp won't last very long as QB coach before getting offered an OC job on another team. Maybe down the road, Lubick will take the QB coach to OC road that Kyle Shanahan did.