To everyone whos surprised about Unohanas 180. Consider it reverting. She did a 180 before, shes done another and completed a revolution. She is now who she was.
Yeah people fearing her was a portrayed a little bit comically, but the intention was always there, to show how powerful she actually is.
1) Kyouraku laughs at being worried about peeving unohana. Pretty sure Ukitake was with him
2) In Hueco Mundo, the guy Rukia n them beat ordered his troops to retreat. She didnt even blatantly threaten him. Even the enemies knew how powerful she was
3) Ichigo, insnaely strong as he is, feared her power too. On the way back from HM to the human world, she politely insists on taking the lead. He lets her, worried about pissing her off too.
Yeah. All these stupidly strong guys (kyouraku is third after Unohana im pretty sure - consider her cracked Aizens shield with just his shikai, while ichigos bankai GT did nothing. Then aizen dodges kyourakus attack, while just blocking/taking head on everyone elses attack. Even he silently acknowledges Kyourakus strength. Oh and he beat Espada 1 with his shikai too) only joked about being worried about pissing off Unohana. Right.
You cant say you werent aware of how stupidly and insanely powerful she is. Should also have taken into account the fact Yamaji never sent her out to fight. She was a captain, shes obviously strong enought to, so why not? Yes we can delve again into the whole argument about different types of medics, but why bother? Even without knowing what we know now, it was a pretty much deadend argument, as there was too much vagueness surrounding it, and things could only be inferred, everyone believing what they want. But i digress.