Everyone has their own approach to something like this. I'm not going to declare one is superior to another. IMHO, Tannehill has performed well, and I'm very happy to have him. On the plus side he has steadily improved despite multiple coordinators and offenses. But, Brady continued to improve well past year 5, so the mystique of Brady isn't built on being a guy who went from rookie to year 5 veteran ... it progressed well past that point. We all hope Tannehill also continues to progress and eventually reaches the heights that Brady has shown for the last 5 years. I think Ryan can.
Ball Security is the one area in those initial 5 years where Brady excels. Looking at Tannehill's interceptions last year, he did a phenomenal job avoiding turnovers once he got over the initial 5 game learning curve. If he can keep that up, he will end this discussion about whether he is our answer at QB. I think he can, and am looking forward to a great season from him.
But this analysis does not take into consideration the OL behind which they played. There is no question that the OL for Tannehill was far inferior. Through his first 3 years he was the worst protected QB ever as far as starting QB's in their first 3 years. We have not had a great running game, arguably until Ajayi, for Tannehill to lean on like most young QB's. Our defensive performance has been erratic at best. Tannehill's circumstance has been far worse than Brady's was in their first 5 years.
Looking at Last year we see some real indications of how that affects him. In the first 5 games when the entire team was learning the offense, Tannehill's protection was putrid. His execution was also very bad. These led to a bunch of INT's. Once the team grasped the offense and started protecting him better, Tannehill was able to get a run of games under his belt where he knew the offense and actually had decent protection, which led to a fantastic stretch of football. I think he had like 1 INT in 7 games and the full stretch of 9 games was good too. If he had averaged those numbers over the entire season, he would have been rivaling Derek Carr as the best QB in the league and NFL MVP prior to getting hurt. If we look at games 6 onward, Tannehill is en fuego.
Tannehill ended up last season as one of the top 3 QB's for Completion Percentage In the Red Zone (3rd behind Breeze and Brady), and #1 at QB Rating In the Red Zone (ahead of Brady). So, when we got the ball down inside the opponents 20 yard line, Tannehill did his job well. Now we need to work on getting the ball down there more often.