It's funny, Mac was good at that his rookie year. He hung in, looked downfield, and stood in until the last minute on a bunch of plays early on and wasn't afraid of taking a shot. Something changed along the way, and he seemed far more hesitant at the end of the season and was obviously also like that throughout most of this past year, especially after week one when he hurt his back at the end.
I 100% agree with you, though, Zappe was pretty fearless, and he was definitely better about sliding up. Mac moves well laterally, but he's not big on climbing the pocket. He tends to sit at the back of the pocket and doesn't really slide up, or at least not as well as Zappe does.
I recall us having similar conversations between Drew and Brady, as Brady was also better in that regard but also got the ball out of his hands faster than Drew did. We've talked about arm strength with Mac and even though his arm is a little stronger than Zappe's, the Bledsoe/Brady comparison sort of proves that part doesn't necessarily mean much.
Honestly, the only thing Zappe needs to do is get a little stronger, which I'm sure is a jump he's going to make this offseason the same way Mac did. He also does need to work on his arm angle, as well as continue getting better at diagnosing defenses as well as Mac. If he does those things, and gets to a point where he doesn't need to stride as much to throw, it's going to close the gap between the two and make the situation interesting, depending on how this year plays out.
Mac needs to separate himself a little more and show a lot more of the touch and accuracy he had in his rookie year. Really hoping to see him thrive under O'Brien, so fingers crossed there. But I am looking forward to seeing Zappe's growth. Again, always a good problem to have when you have two solid young guys who can play.