Sport on A Happy Thought

I have a cutting of A Happy Thought growing. A new shoot that has emerged
from below is a sport with all light green to yellow leaves, uniform colour,
and no butterly marking. Since I know nothing about this cultivar and am not
very knowledgable about these things in general, I wonder if the
greenish-yellow shoot is a sport or if perhaps A Happy Thought in itself is
a sport from a greeish-yellow cultivar to which the new shoot has
reverted???

Anyway, I will try to grow on cuttings from both.

Anybody knows about the origin of A Happy Thought?
Regards,
Gunnar
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