Yes, I know, Pro Football Focus is sometimes really suspect and Wonky, but here is the explanation from Jeff Dooley for the Washington post.
"There seems to be a perception that Winston, the No. 1 overall pick out of Florida State, has been bad this season, and for two of his six games that has been true. He had the second-worst performance of any QB in a game this year in his NFL debut against Tennessee, which looked even worse in comparison to the perfect passer rating posted by the No. 2 overall pick of the Titans, Marcus Mariota. He also had a terrible performance in Week 4 against Carolina.
But if you take those two games away - his first game ever and a game against one of the NFL's elite defenses - he has been excellent. He's shown a great ability to make difficult throws. His specialty so far has been go routes. He's attempted them on 10 percent of his passes, completing 8 of 16 for three touchdowns and zero interceptions, with an NFL passer rating 51 points higher than the NFL average on that pass pattern.
Now, is the No. 26 quarterback in our rankings, with a 61.4 grade, really worthy of the No. 1 spot on this list? It's a fair question. But consider that Winston has already provided the Bucs with an upgrade over last year's starter, Josh McCown (No. 30 in PFF grades last year), even with his periodic bad games, and the upside he provides with his good games is so much higher."
Cornerback Ronald Darby comes in at No. 4.
"The second-rounder out of Florida State currently ranks No. 3 among all cornerbacks, with an elite 90.6 grade. That would be remarkable at any position, but is especially so at corner, which is traditionally one of the harder transitions to make for college players. Not only that, but Rex Ryan's defensive scheme asks a lot of its corners, frequently requiring them to hold up on the outside in one-on-one coverage (Darby and teammate Stephon Gilmore have been targeted the third- and second-most, respectively, among CBs this season).
But even though Darby has been picked on, he's fared remarkably well, allowing the ninth-lowest catch percentage in the league and zero touchdowns, while intercepting two passes and knocking away eight more. He's also been good in run defense, missing just one tackle all season. He'd be No. 1 on this list if it were about pure production."