I didn't say he would go back to his old job as SC. I'm saying that he may be willing to risk waiting it out in hopes of getting the HC job. Really hard for Special Teams Coordinators to get HC jobs so he has to be patient. I think it's unlikely he would be kept here at the SC because of the reason you mentioned. But he may be willing to risk that he won't get a SC job this year for the shot at a HC job.
But, he can probably still get a SC job somewhere if he can't get the HC job here as long as it doesn't linger too long after the SB.