Another angle not mentioned is maybe they don't trust Tannehill to audible because he's not very good at it?
But yeah.... his blind acceptance, wish washy demeanor, flat line passion combined with mediocre skill is why he & we will never achieve great (or even good) results with him as QB. IMO, the sooner he's gone the better. Even though I have no love or appreciation for Gase I'm willing to see what he could do with a new guy of his choosing (some early mocks have us grabbing Herbert or Grier...not my choices but hey, who knows?) and supposed "guru-ness". Plus, then Gase will have no excuses for failures since he "shopped for the groceries". I really think Gase gets a pass this year and Tannehill goes...then Gase has next season and 2020 as a make or break years (of course with Ross, who knows....Gase may be here 5 more years of mediocrity after that).
For all we know Gase, despite saying all the right things, feels or knows he is hamstrung with an ineffective, marginal QB and wants to move on/develop his own guy.....hopefully, in 2019 he gets that chance.