I have it at 2 (3 if NATO is at 125 and starving himself)
last season's dual:
125: Suriano defeated Jose Rodriguez by TF
133: Carpenter lost to NaTo by TF
141: Gulibon defeated Pletcher by dec, 5-3
149: Zain defeated M. Jordan by TF
157: Nolf pinned Anthony DeCarlo
165: Joseph majored Cody Burcher, 11-1
174: Hall pinned Justin Kresovic
184: Bo defeated Myles Martin by dec, 8-2
197: Cutch lost to Kollin Moore by dec, 6-9
285: Nevills lost to Kyle Snyder by major, 9-19
Rodriguez, NaTo, Pletcher, Jordan, Burcher, Martin, Moore, and Snyder were starters.
DeCarlo was in for Ryan. Kresovic was in for BoJo.
Ryan seemed to be battling injuries during the season (never really clarified), and reports are that he's done with wrestling due to the injuries. BoJo battled injuries all season.
With the huge crowd that tOSU had for the PSU dual, it was unfortunate that they didn't send out their best squad. And while I do think Tan Tom manipulates things at times, I don't hold him responsible for 2 guys not being able to go in the dual due to injuries.