Just sitting here discussing it with my ortho colleague. He says if it's one of the three middle bones (which with a slash makes sense,) then the fracture has natural splints on either side, and the plates and screws are now designed to provide very tight fixation such that they can have early mobilization. Plus, presumably money is no object so I'm sure he got bone stimulator treatment and if there are any new wonderdrugs to speed healing I'm sure he got those too.
By game 1 he will be 4 weeks out from surgery so the soft tissue will be healed.
Plus unlike a knee or Achilles, if this repair fails, he just has surgery again and should still be fully recovered by the fall.