By basic rhythm form of jazz I mean that it isn't written on top of a clave rhythm. Which means that as changing as it is, it will be a 1,2,3,4... Just as son, however in son the 1,2,3,4 are molded to emphasize the clave... Just a thought... There were a number of Jazz composers who tried to composed for salseros, however they never really made it because their Jazz composing skills never added the clave and backbone of the music... God I forget what Willie Colon's song in specific is the best example of this, but it is a very popular one. When it was first written by, at the time, one of the most famous Jazz composers (which scapes me the name), well, everyone loved the arraingement but it had to be handed back to Louie Ramirez to re-make with a salsa beat. For his Jazz approach as appealing as it was to a Jazz like tune, didn't make it a salsa but a straight up 1,2,3,4 feel, which salsa hasn't. You have defintely put it rather nicely when expressing the different of the mixture of both rhythms. I do still feel that a latin-Jazz and a Jazz sound differently, but I mean it not as a bad thing. I actually love latin jazz, yet I can't stand any other form of Jazz, unless is very percussive.