Actually I had a "custom shop" Jackson Stars Rhoads built and it did not have Made in Japan on there, not even a sticker. I wish I hadn't had to sell that guitar, it was incredibly nice.
Yes Grover Jackson and Jackson Stars were Jackson, there's a lot of threads about all of that if you do a search on here with far more information than I can fit in my head, lol. there's a whole history of the shop they were built in, etc.

GJ2 is Grover Jackson, I'm not sure if he still owned Jackson when the "Grover Jackson" japan only guitars were being built or not, the whole "Grover Jackson" name on the Japanese only guitars was because there was already(?) a Jackson product (not related to guitars I believe) but this is why search is your friend (well, a cruel friend, the search on here isn't perfect, but it does work )

Here is some information:

http://audiozone.dk/index-filer/JacksonStars.htm

Only some bolt-on models circa 2004-2006 had this inscription on headstock. But yes, all Grover Jackson or Jackson Stars branded guitars were made in Japan or US.

Yep.