Is it worth combining the Sange and Yasha?

[Jakaal]

All I know is that there is a faq on ign.com that has drop charts for all difficulties, enemies, and Section IDs. It tells me that I can find a Yasha from a Melqueek but my chances are like 1/68000 and some. Same goes for the real Agito only I can fins it from a Tollaw. That section ID is Viridia by the way. The Sange one of my friends has a 1/2 chance of finding it from one of the rare monsters but I forget what. So far all of my drops have been the same as the guide in every mode except for the Flowen's Shield/Frame mixup.