Unless something has drastically changed since I left, you underestimate the ability of scheduling to be as inefficient as possible to make themselves look good to ensure reserve utilization is as high as possible. Did they eliminate ARC for TYS? If not, in a 5 block, I could EASILY foresee;

Day 1) 6am ARC, not used
Day 2) 6am show to operate TYS-EWR-(insert overnight)
Day 3) (insert overnight)-IAH, sit 3 hours-DH-TYS
Day 4) not used
Day 5) 6am show, operate TYS-EWR, sit 4 hours, DH EWR-TYS.

With the exception of no ARC on the last day per CBA, ANY OTHER clever combination of the above.

As mentioned, maybe scheduling has changed, but I doubt it.