Let see, he only played six seasons in the NFL. He was never the starter, he was always a backup. When he did start games, it was generally due to injury (LaFluer). The Cowboys let him go because he wasn't a starting caliber TE. While you could say the same about Fasano here, but then again, Fasano was behind Witten and LeFluer isn't even close to what Witten is. Secondly, Fasano could start for several teams and will probably be the starter for the Dolphin this season.
Parcells didn't trade for him because he sucks. So many people like to bash Parcells for his draft picks, but take a look at today's roster. Most of them arrived in the Parcells era.