I don't consider deep balls tight windows. So the point about Dotson doesn't relate. Again, the nextgen stat is not complete. Were the tight window throw(s) complete? Were they intercepted, defended etc.?
Willingness to throw into tight windows says nothing about the QB. I mean look at the company of QBs Alex is in (Rogers and Brees). Not bad company. Now Kirk is in that company too, yes. But again, the problem with Kirk is his inability to extend plays while refusing (for a lack of a better word) to throw into tight windows where the play may have been designed.
So the play breaks down, because Kirk didn't throw the ball in that tight window. He begins to drift back or some other variation of movements, only to throw it out of bounds, take a sack, or give the ball away (check how many times Kirk threw an interception when under pressure. I think he ranks pretty poorly). You extend plays to open windows up. Gruden also mentioned that every play is not going to work the way its drawn up. Kirk struggles with that. There's nothing wrong with extending plays to make plays. Alex has been known to do that. Kirk hasn't.
Kirk reminds of that carry out cashier we've all run into. You buy something for .99. So you give the cashier a $1.04 and they become stumped on what change to give you because they've been programmed to accept one dollar and give back a penny. They sit there in the window with the deer in the headlight look. When the play breaks down, we've seen that very look in Kirk's eyes.
On another note, the Eagle's head coach commented that he is going to hate facing Alex Smith twice a year. I'll take the validity of that comment over a Nextgen tweet any day.