Hi Derek,
I have just one example of that complex cane in a reference weight (has a couple of not-so-disastrous internal stress fractures). Unfortunately, the cane in my weight is a) next to one of the fractures and b) in a position where the dome does not provide the best, or clearest, magnification.
I assume the "thistle" is the cane with a pale yellow outer coating, a white inner around a grey core, and is situated on the edge of the complex setup, between the two larger canes, one with an oarnge central rod and the other with a blue rod. I can see how that can appear to be a thistle with rounded sides being the base of the thistle head and with three (or perhaps four?) "spikes" representing the top of the thistle.
I think in reality it is a squashed circular cane having a regular 8-lobe daisy (or star) as its inner design. If it were a true thistle design, why would it have two "spikes" as a stem? If the "thistle" part was deliberately shaped in that way (as with known "portrait" type canes such as the Spade and Diamond canes) surely it would have been set as a pre-formed centre to a regular circular cane, as with all the other "portrait" ones.
Howver, I will keep an open mind and look out for other examples that might appear, either in other complex canes or as a cane in its own right.