Jarius Wynn? Manny Lawson? You act like Jerry Hughes is some proven Pro Bowl talent who has killed it his entire career. He was a bum for 3 years with the Colts and then he came and flourished alongside the best defensive line in the league for two years. At no point in his career has he proven to be an elite player on his own. Jarius Wynn, Manny Lawson, or whoever else the Bills brought in would benefit from playing on the same line that Hughes did and would probably do fine.
And more importantly, I'd rather have a stud TE than Hughes any day of the week. I'm sure plenty of DEs will be able to get pressure on the QB when the line has to double team Mario, Dareus, or Kyle Williams.