So, for those of you who were wondering how this would end up, here it is:
Somewhat interestingly, he chose the
Wilson Shift 99, mainly because, even though the Shift doesn't serve as well as the PD+, nor does it help Nick create the most power on his backhand or forehand as the PD+ or TFight 300, he feels it will be the best at helping to stop the bleeding on his declining forehand, by allowing him more control through easier application of spin and shot curvature, allowing him to make more shots when he really starts to rip it. Plus he really likes it for coaching and net play. And he thinks it just feels good in the hand as well.
An interesting ultimate decision maker, especially for those on the forum who wonder whether it's better to pick something that helps address your biggest weakness(es), versus enhance your biggest strength(s). In this case, Nick chose the former, and I can certainly empathize with him as to why, considering his situation.
That said, I personally thought he would have chosen the P100, TF300 or even '21 PD+ (as anti-climactic as that would have been) before the Shift, mainly due to the others being closer to home, more consistent for him in other ways, and the dual flex of the Shift in my eyes being possibly a bit too incompatible with some of his mechanics/tendencies. But hey, what do I know. He's the coach, expert and the one who will play with it. And he arrived at that decision by seemingly sticking to his process and no one else's, even to the point of walking away from a free Tecnifibre sponsorship and collaboration (though we don't really know if Wilson approached him behind the scenes, either). Regardless, an entertaining series. I will be keen, though, to see if he still feels the same way about the Shift once he gets enough play time under his belt with it. We'll see!
(I was going to hide my thoughts behind a Spoiler tag, but then I thought "screw it; if someone quotes my writing later it will just expose it anyways", so I just made it viewable. Hope that doesn't ruin anyone's suspense.