That escalated quickly. On Monday, Vikings coach Kevin O’Connell said Mason’s “sore thumb” was being evaluated. Apparently, it had sustained a small fracture, which has now been “fixed,” ostensibly surgically, given O’Connell’s phrasing. Short-term injured reserve placement requires players to miss four games, but the Vikings are on bye in Week 6, so Mason will be eligible to return in Week 7. Mason led the backfield with 15 carries in Week 1, so his absence provides RB Aaron Jones with a touch-count boost. Veteran RB DeeJay Dallas operated as the RB3. Rookie RB Demond Claiborne was inactive last week, but should be active in Week 2 against the Lions. Speculatively stashing him could be worthwhile.