Here is the crux of what I said in the other article:
There are 5 skill positions on offense outside of the QB. Parcells is big on having threats that the defense has to honor at every position. Dallas had good threats at 4 spots with TO, Glenn, Witten, and JJ/Barber. Their options at TE#2/FB were Ryan Hannan, Brett Pierce, and Lousaka Polite. None of those guys threatened a defense.
Fasano is a guy that should be a threat to the defense. He has ok speed, but has good moves and good hands. He should be able to beat linebackers in coverage. With Witten on the other side, he's not likely to face team's best coverage linebacker anyway.
So with Fasano at the #5 skill position, Dallas can create matchup problems for a defense. If you go nickle to stop TO/Glenn/Witten, then Dallas runs or hits Fasano on some short patterns. If the defense moves up to play the run, then Glenn and TO go deep. Fasano allows Dallas to be very diversified in their base offense. Defenses won't know if runs or passes are coming. Every skill position will be able to do something to hurt the D. That wasn't always the case this past year.