Ah, thanks! There is so much variation in how Sanchin is done. I usually think of Uechi as being at a 'softer' end, relative to, say, the Goju version.
The posts on Wikipedia prompting this discussion also suggested that there is Mantis and Cobra influence in Uechi. Apparently the alleged mantis influence was from Southern Mantis, which is not a mantis style at all (more Dragon). I also don't think there's a Chinese Cobra style, but perhaps it is a subset of the more general Snake style.