Doesn't matter now since you admitted that explosive tags isn't taking Tsunade down. And no, Obito's arms must be the most vulnerable part of his body. The explosion took off a piece of his mask, half of his Akatsuki robe, and his entire arm... but everything else was fine and intact. Just like
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, among his entire body, it was only his arm that took most of the damage, despite it never even being directly hit. Thus, I'll conclude once again, that his Zetsu arms are the frailest parts of his body. Also, Konan didn't tank anything. If you look at the amont of existing paper before Jiraiya used his Katon [
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] and compare it to the non-existent amount of paper after [
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], then you can conclude that she used the paper to counter/block the Katon from hitting her (which I believe is what occured in the anime as well). There is no way she tanked the Katon using her own body.
I asked for DB scans that would back up your claims that Konans paper attacks are capable of cutting deeply into Tsunade, and even bisecting her. Anyways, her counters to all of that is easy.
A)She could summon Katsuyu
B)Rely on the shockwaves caused by her CES to blow the paper away
Assuming she somehow allows herself to get engulfed by paper in a similar fashion to the scans you posted, then she simply cuts herself out with chakra scalpel. Tsunade doesn't need to be able to freely function her fingers individually... She overpowers Konans restraints with her immense strength, and uses chakra scalpel to gradually cut herself free. If you want to argue that Konan simply would apply more paper as Tsunade attempts to free herself, then revisit A and B. Again, Tsunade cannonically survived being bisected, and recovered from it. That isn't an issue, as long as she can summon Katsuyu.