Witten is 2nd in receiving yards among all TEs, and 2nd in receptions. I believe he is first in games played. His receiving yards per game and TDs might be a little lower than some of the other leaders but his stats are better than some other HoF TEs.
He should be a first ballot HoF inductee. Then again, he played for Dallas so he may have to wait.
I think Dez had HoF talent but his reputation and length of his career will keep him out of the HoF. I don't know what happened to Dez but he lost the ability to get open and make plays very quickly.
Sean Lee could have been great but didn't play enough due to injuries.
Of the rest of these guys, Brees, Fitzgerald, Frank Gore, Mike Pouncey, and Geno Atkins will probably get in, not necessarily on the first ballot for all of them.