In a possible twist-of-events, Adrian Peterson may receive a suspension from the NFL, as his paid leave while he was settling his court case may not count as disciplinary action.
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As a result, don't sell Jerrick McKinnon yet, and don't immediately trade for Adrian Peterson just yet until we know how long he could be out. Outside of the procedural time it takes to get Adrian Peterson reinstated, Peterson may also be rusty after not playing at game shape, too.
Consequently, the best thing to do in this situation is to wait and see.