Im sure they are not. SP puts more emphasis on players knowing his complex system. However, veteran WRs know different variations of the offense. The verbiage is different. Guys can switch teams and get the system down by studying hard. I’m not sure why we don’t ever make those mid season trades? It’s not like they would be completely lost. Sanders got it down, with no off-season, training camp, or preseason games. I believe he said that he studied non-stop for the first week just to get the plays down and then it was a matter of getting reps. Which came when the season finally started