The line doesn't make sense to me. I'll look at it more when I get a little time/bored.
A quick glance at power rankings show Army -4 on a neutral field. IF HFA is average (2.5) for ECU, that would lend to Army still being favored by 1.5.
A quick glance at efficiency numbers and ECU has a slight edge with special teams, they are close but trailing Army in defensive efficiency, and are in another world with offensive efficiency (top 20 team in Army, 93rd for ECU, out of 135 teams.)
Geesh...the more I look.