I don't want to be overly pessimistic but there are many environmental causes for stripes and sectors of different shades of colour and missing colour in flowers. Most of these are simply one-off developmental glitches. When one looks very carefully one can almost find one stripe or similar anomaly in the majority of flowers. Both temperature and light have important effects on the presence/absence and amount of pigments produced. Different parts of a flower can be different temperatures and have different light/shade conditions so that variations in colour in a flower can simply reflect an unusual temperature or light effect that occurred during the development of that flower bud.
I would expect that Flasher is stable all the time and in all growing conditions. Typically events such as visible sports or mutations occur naturally about one in hundreds of thousand or millions of individuals.
