As a breeder of Shorthorn cattle in Southern Alabama, I have looked at using SG as a cross to increase solid color patterns and to increase heat tolerance. The reason for looking for solid color patterns is due to local breeders wanting solid colored pattern bull. There are many Longhorn and Longhorn crosses in our are the farmers don't want the roan calves from shorthorn because to the uneducated the discount them as longhorns.
The main reason or concerns that hve kept me from crossing SG to shorthorn has been the concern of temperment and too much leather.
Our cattle are typically handled and worked by a single person either my father or myself. Since we typically have only one of us working cattle at a time temperment is extremely important. With shorthorn the temperment is great, did not want to ruin it by using wild SG.
Also, I felt that SG would bring down the overall thicknes of the cattle down while attributing to larger cow size. Most of the SG, I have seen were quite large framed.
I may be wrong but to me SG are a breed that got a little behind the times as for a Brahman influenced breeds go and have a lot of catching up to do. If they clean up the excess leather, modrate frame size and imporve temperment then they have a chance at being a strong voice in the Brahman influenced cattle world, and the comercial brood stock business.
If you have evidence to point otherwise I would be glad to hear it. I have always loved the dark red color of SG.