Adrian had plenty of time to plant his feet and wait for receivers who apparently didn't get open.
I'm not sure that's really the case. At times, sure. But Pro Football Focus differentiates between when the OL gives up pressure and when the QB holds it too long and gets pressured. I don't know how many pressures they credited to Martinez but the line was credited with giving up pressures/hits/sacks 16 times on 34 pass attempts (including sacks). Basically every other pass play he was getting pressured. Being under that much heat definitely has an effect, even when you're not getting pressured.
I know much was made of Martinez overthrowing Hickman in the left flat on one play. The announcers talked about Martinez missing another target. But when they showed the replay, Martinez was having to slide left to avoid pressure and then was basically skipping away from the guy trying to grab his ankles as he was throwing. But they didn't make any mention of that. That's a far from ideal way to try to throw a pass.