While Tannehill shined last season once the Gase system kicked in, several of FH's comparative "poster boys" who were held up against him as in "we could do better" by T-Hill detractors including Winston, Mariota, Carr, Prescott, have not fared too well compared to that run. In all fairness, just like it was with Tannehill in the past saddled with the worst rated OLs, questionable available receivers and bi-polar rushing attacks, it's certainly not all on these guys either. However a case can be made that once Prescott lost Zeke and no longer protected by an elite OL, he was a different QB until he regained some of that juju once Dallas' RB tandem started to become effective and his line protected him better.
With the exception of Baker Mayfield who like Jamal Adams, exudes the unique and valued "It Factor" to become a respected leader and winner wherever he ends up, I agree with the poster who opined that none of these QBs coming out now are as good as a healthy Tannehill... but of course that's "the rub"
As a matter of fact, since Tannehill's draft an argument can be made that at this point only Wilson and Luck are better QBs. Cousins IMO, is at best comparable and Garoppolo looks impressive as hell but it's only 2 games, very little tape in Shanahan's system so not really relevant as a benchmark.