Sanders played in a total of 188 games and had 53 Int and 9 Tds. Take a look at his number of tackles for his career:
https://www.nfl.com/players/deion-sanders/stats/career
Sanders had extra value and returned kicks and also played WR—that added to his greatest.
PP2 has been a much more physical player and has a lot more tackles & assists to his credit but also about half the INTs in his stat line (27 in 145 games). Early in his career he returned kicks and has played some WR—but not near the level of Sanders involvement.
https://www.nfl.com/players/patrick-peterson/stats/
Sanders is to the extreme of being a cover corner—teams absolutely refused to throw in his direction and when they did he’d go for the INT and often take the pick to the house. Teams also knew to run at him since they knew he would do the moon walk away from the tackle (just look at his career tackles).
The point to trade PP2 is that he is still playing at a high level as a cover corner. But the signs are there that it is time to trade and get maximum value. In the SeaTurkey game, two Tds went over PP2—he had tight defense and came within a few inches of breaking up the play both times. The question is—at this point in his career is he going to close that distance and get that hand in there OR is it more likely that the distance of a near miss is going to increase?
At this point in the season, Cards look to be in position to both make the playoffs and also to compete. Would you trade PP2 for a young pass rushing DL or OLB? Do we have enough pass rush with the loss of CJ? Granted we are thin at CB even with PP2 on the roster---but are we hurting as much if not more with the pass rush? Can we plug in a Murphy at CB provided we get a beast pass rusher? Or will we be a better team with PP2 and a weak pass rush?
I do like to see more physical play from the CB—I wish PP2 would turn and defend the goal when his coverage duties have been accomplished. Note that Murphy will mix it up as a slot corner. I don’t expect the CB to trot toward the tackle and leave it to the other DBs to close and make the stop. I think PP2 is at max trade value and the time is right to get the highest return in trade. (I made my point. You are welcome to disagree.)