Thanks, I really like the chartreuse color in the leaves, too, Rick. It does seem to be happy with a lot of sun. I have it with all of my others, right along side them. Now, the yellow/chartreuse branch does get some coverage from the main "normal" variegated branch in the third pic, but otherwise it is in near full sun. In fact, I moved it from a more shaded spot because it didn't seem to be completely happy and was losing some leaves.
The plant has 2 separate scions, and the scion the yellow sport (you're right about it being more chartreuse, but that is too long to keep typing!) is sprouting from almost died before it leafed out. I just left it alone and soon the dieback stopped and it popped several buds (definitely above the graft). The other taller scion has done fine the whole time. Once I moved the plant to more sun it started doing much better overall. I'm hoping the flower buds will hold - it'll be interesting to if the flowers bloom the normal color or if they will be different, as well. Oddly enough, only the sport has formed buds. The rest of the plant is growing well, but didn't bloom. I think I read that A. somalense blooms in the winter dormant phase when it is leafless, tho, correct? If so, it's particularly odd that the sport would bloom.