Meh! – Thank you!!
I've been mulling many of these thoughts too, but just couldn't put them into words as eloquently as you have ... I think your characterization of Ippon Matsu is perceptive and gives him more credit and sympathy than most OP readers do. _In a previous thread, I said that it seemed as if a very strong emotion/feeling was keeping Zoro from letting go of Yubashiri. I caught the vibe, but couldn't place it exactly – but I think your guess is dead-on : that the "very strong emotion" is a mix of guilt, frustration, anger, and sadness. I sense too that Zoro somehow feels he's failed Ippon Matsu or betrayed his trust by breaking Ippon Matsu's family treasure as well as his dream.
And because of this -- (and the fact that there isn't much left of the blade) -- I feel that reforging can't be an option : it would reek of "whoops! try it again! I goofed the first time!". Yet letting go of Yubashiri couldn't be an option either, because that would be worse than breaking a promise : that would be abandoning a promise! And if there's one thing we know about Zoro, it's that he takes his promises very seriously.
The only other "solution" that comes to my mind is for Zoro to somehow adapt his Santoryu techinques so that they incorporate two perfect swords and one broken sword. (I know this sounds odd, but we've seen in other anime – like RuroKen -- that a broken sword is not entirely worthless, that it can still be used for blocking and defense, and like a blunt dagger at close range).
One last thing : you mentioned the beauty of a sword -- the curve of the blade, the patterns from tempering, etc. and I think it was Refii who said that a good sword makes a good swordsman better ...
... these two things I know from experience -- not with swords, but with kitchen knives. :)
I'm a fairly good cook (nowhere near as good as Sanji though!) so a few years back, I bought myself three high-quality kitchen knives. After a while, I began to sense that the knives were making my cooking better.
How? Well, they were sharper, so cutting was easier. They were durable, so I could use them heavily. They had nice balance, so I didn't have to exert as much pressure to cut through things. The handles were carefully shaped, so it was easier get a good grip on them and therefore I was less likely to cut myself with them. And finally, since they were easy to use and felt comfortable in my hands, I was more inclined to prepare food that required a lot of cutting than I'd ever been before, so I tried out a bigger variety of recipes.
Trial and error taught me how to sharpen them and how to store them and wash them to keep them strong. I am very attached to these knives. Like sanji says, they're "the soul of a cook".
I imagine it's the same feeling -- only much much stronger -- between a swordsman and a sword. Especially if the swordsman has to carry the additional psychological weight of two other swords(wo)men with him. Think about it : he's carrying two dreams as well as two treasures (Kuina's and Matsu's).
And who knows what psychological baggage the third sword (Kitetsu) brings with it ..._