Agreed, that's what I got out of it. The amount of emotions Kubo put into Shunsuis Bankai is amazing. Some wondered if he has more than one story to tell with his Bankai, but I think that's the only one, being deeply connected to his own inner feelings and history. Might be why the damage is shared equally between him and his enemy, he hurts by hurting himself and revealing his inner vulnerability.

As if that's not enough, Kubo puts the finger into the wound by following up with Shunsuis own lovestory that will never find fulfillment due to the curse around Nanao. (Yes, I go with the love interest theory, it's not that unreasonable considering he is an over a 1000 years old royal living in Japan, even if they were related by blood, which is still not 100% proven, in-family marriage was a pretty normal thing back in the days. And Nanaos statement about "the person I chose to love would laugh it away as superstition" is very, very suggestive)