I don't think there's any way that Hankins is close to being around at that point myself.
Not sure if you saw or not, but Scott Pioli recently picked his top 5 as had J.Hankins as the 5th overall underclassman available.
NFL Draft 2013: Scott Pioli's Top Ten Underclassmen - Music City Miracles
Of course I've seen it. It's irrelevant what Pioli thinks.
Hankins was rated a possible top 5 talent going into this season, but that doesn't guarantee anything. Look at Da'Quan Bowers 2 years ago.
Most teams draft on need as much as by BPA. There are only so many teams who are going to take a defensive tackle, no matter how good. And this is a very deep draft for defensive tackles. Right now NFL DraftScout ranks them as follows:
1. Star Lotulelei, Utah (7 overall)
2. Sheldon Richardson, Missouri (10)
3. Sharrif Floyd, Florida (17)
4. Jesse Williams, Alabama (22)
5. Johnathan Hankins, Ohio St. (28)
There are 2 other DTs ranked quite highly - Johnathan Jenkins of Georgia (#31 overall) and Kawann Short of Purdue (#42). Both had good Senior Bowl weeks, and Short in particular seems to be on the rise a bit. Some people also think that Sylvester Williams of North Carolina could sneak into the 1st round.
Many people have Hankins no better than the #4 DT, sometimes lower. NE PatriotsDraft has him ranked #26 overall, and the #5 DT. There's going to be some movement among those guys between now and April, but there's almost no conceivable way they will all be off the board before #29. Consider the previous history of 1st round DTs:
2012: Poe (11), Cox (12), Brockers (14); Derek Wolfe went 36
2011: Dareus (3), Fairley (13), Liuget (18) (converted to DE), Taylor (21), Wilkerson (30)
2010: Suh (2), McCoy (3), Alualu (10), Williams (22), Odrick (28); Brian Price went 35
2009: Raji (9), Jerry (24), Hood (32)
2008: Dorsey (5), Ellis (7), Ballmer (converted to 3-4 DE) 29
2007: Okoye (10), Carriker (13), Harrell (16); Alan Branch went 33
2006: Ngata (12), Bunkley (14), McCargo (26)
2005: Johnson (16), Patterson (31)
2004: Harris (14), Wilfork (21), Tubbs (23)
2003: Robertson (4), Sullivan (6), Williams (9), Kennedy 12, Warren (converted to 3-4 DE) 13, Josephy (25)
2002: Sims (6), Henderson (9), Bryant (12), Haynesworth (15)
2001: Warren (3), Seymour (6), Lewis (12), Stroud (13), Hampton (19), Pickett (29)
I think the odds are astronomical that all 7 top DTs will be off the board before #29 - that would be 1 in every 4 picks a DT - and that there's a good chance that the #5 DT could slip to the Pats at #29. That would mean one of Lotulelei, Richardson, Floyd, Williams or Hankins. I'd take any of those guys at #29. It's not out of the question that Short or Jenkins could move ahead of one or more before all is done.
The odds of the Pats picking up a darn good DT at 29, whether Hankins or someone else, are pretty good. With that many DTs there's going to be a lot of volatility, and a better chance that someone like Hankins could fall.