mac just does not look confident behind the line, unfortunately he does not seem to have posture to step up, move in the pocket or avoid the rush, he just seems lost, ducks down way to early in the eye of passrush or moves like a chicken without a head comletely lost...now it comes partly of the poor play of the OL but also of poor scheme for him, as a coach you gotta help your players out, offensively i don't see that, at times its mindblowing how bad and predictable the play calls are, thats also part of the RZ issues, you have some nice big weapons and you don't use them at all
But coming back to mac, the lack of confidence is actually multiplaying his issues, his inner clock is way faster than the passrush actually is at him, leading him to lock on first read no matter if 2nd or 3rd read are open by a mile, he does not progress there at all bc he feels the rush but not in a positive way, partly the OL looks bad as well bc of macs pocket presence and inability to manover within the pocket without panicking, i am no expert but to me it seems as it is a mixture of bad experience, lack of confidence(mental), bad technic
I am not for zeppe nor for mac, just saying what i have seen so far and i liked zeppes pocket awerness and movement way better than macs, next to him having a better sense for the pass rush, a lot of work ahead of the O, hope they improve and figure it out (with a real OC/QB coach