Oh I forgot to answer this. Know Tsunade roll? Lol. She does not know her own role. You can not assume I think she is a healer because she is always going against her own saying which medical should stay back healing examples Tsuanade,j-man, Naruto fight if she was a healer she would have let those other guys fight.... Nope she went for Kabuto
another example her fighting against Madara even if she said one (medical) must stay out of battle unless they gain her special abilities (which she is the only one who has in the full form...) She even went into battle then. Did she heal then... no her slug did.
busting madara's susano'o you said when everyone teamed up on one sasao... Now picture one Susano which fully had the focus of it user in a one vs one battle against Tsunade. Pick a user Sasuke? Madara? Itachi? She is going to get sliced before one of her slow punches lands a hit on Susano without distractions.
You say Gaara who killed Jonin is the most seasoned? Woah... Slow down buddy he is more seasoned than an old Onoki who hired Atsukai, who fought with a Madara in his youth, who went through world wars already?
More seasoned than Ay who was also in a war world, who fought other kages, who is heading the alliance?
A guy who already took a L twice already from Dendira, Naruto, and maybe a tie from a sick Kim? Please... don't say stuff you fully do not understand.
Now you talk about Mei almost killinngs and how Onoki back fails him. Well tell me what mei,Tsunade and Gaara could have done to this
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Without Onoki...
Now just imagen if Tusande even get close to someone that could fly light Onoki and take a swing
Ultralight-Weight would just make her weak.
Slug princess without strength has nothing so she is playing tag with Onoki and not trying to go full out hand to hand with Ay cause she would get man handle literally.