Very good analysis... appearantly allot of people will find any reason not to beleive in Tsunade but whatever...
However, I disagree sightly on the resistance to jinton aspect, being that if the jutsu is activated and completely covers the body of Tsunade, regardless of when her enzymatic processes prep any molecule created will be rearranged and denatured before it can rebuild, If you ask me jinton is her Base and primary weakness. She wouldn't have the ability to store Store it either because the techniques fire rate is extremely too fast after it is casted...
Regarding amaterasu... I COMPLETLY AGREE WITH YOU, Jairaya clearly Sealed the fire in Pt1 in which allot people didn't see or read in your post because they only came here to hate on your post... but like you said by storing external chakra to her seal she can stop ameterasu... Funny thing Is there weren't any non fodder ninja that was successfully completely burned by ametarasu... although the flames are inextinguishable... they burn slowly and Tsunades Mitotic regeneration is Instantaneous and infinite... So ametarasu has no way of killing her... She can basically fight while ameterasu continues to burn away at her flesh....