Sure, but now the roof will not be framed correctly. Gene wants the trusses to bear on that kitchen wall and the roof above the Kitchen to overlay on top (look at his roof framing plan). Joining the roofs creates a structural valley in lieu of what I mentioned above. Now image if there is no wall between the Kitchen and Living and you want a girder truss to carry the Living room trusses. Joining the roof makes the creation of a girder truss almost impossible.
Maybe I'm missing something and I would love to know how to make this scenario work properly.
Try reversing the direction of the wall in question. Also, your 12" roof beam is outboard of that upper wall, which will cut the siding out. See my screenshot.
ChristianA's post in Truss ends stop wall finish from reaching ceiling was marked as the answer