GDG was also popular in England for a long time. I even have a PDF of a Carl Fischer method for 3 string bass tuned in this way.
according to jeff bradetich, bottesini used this tuning as well- up a step- so, A E A.
Torello, on the other hand, used his solo bass as a three stringer his whole career. This is a conservative holdover from an older time in the tradition he learned, and although it amounts to the same practice, one is "progressive" historically informed performance practice, and the other is "conservative" to the point of being somewhat dinosauric. I think it is good to be aware of this distinction.
absolutely right!