The end couldn't come soon enough, but back to boas.
If you look at the morphology of pure line Arabesques they have some distinct characteristics. Most notably in their head shape. As a result of this, I think the morph either affects morphology and not just pattern/color (I've begun to think this is the case from seeing Albino and Hypo Arabesques with the same head shape); or the morphologic differences are because of where the trait originated.
Some other Colombian morphs have unique traits that may be traced to origin as well. In this list, I am not counting altered animals through selective breeding, but how they were first found. Anerythristics tend to have blockier saddles. Sharp Albinos and T-plus Colombians seem to have very similar pattern characteristics, and body structure. Their patterns are often very full, and the broad saddles have small widows peaks. And are not connected.
As I said, this is not necessarily the case with selective captive breeding, which has created thin saddled versions of these morphs, and connected patterns, taking away widows peaks.
Just some things to think of. Certain group traits are most likely due to geographic differences. This may or may not be true, but it is possible. Look at boas from the same regions that Arabesque, T-Plus, or Sharp were found, and see if each respective locale had traits alike to the founding stock of the morph, or if it is a characteristic of the morph.
opinons are like a--holes... everybody has one and they all stink 
