So it is a 8-9 hour drive from Orlando to Fayetteville. With that in mind.. it would be an 18 hour round trip with no stops. Then factor in time to commit the crime, hide evidence, etc. It is unlikely that the husband was able to leave town undetected. If he is guilty it would take alibis lying for him (not unheard of). It would make perfect sense that she got startled when she saw he was home and didn't want him to see her roll up in a guy's car. It would also leave a lot of territory to hide evidence and God forbid a body on the way home. He may have been able to get home in the last evening Saturday/early morning hours of Sunday. Since he doesn't seem to be a POI (at least publicly), he must have solid alibis.
I am not saying I believe the husband is guilty. However if Nick is, he has to be the dumbest criminal of all time. People saw him leave the bar with her and he was well known at the bar. If he did it, he had to of known he would be the first POI.