I think mainly that regardless of what way you train for your black belt, you would be better served by testing in your system. I am not a BBT or TSD practitioner, per se. But imagine that you are SKH or RVD and a potential shodan wants to test with you, but didn't want to train with you? What would you do? I would definitely decline testing you, as you are not my student. If you trained TSD, either Home study or in the Dojo, you are essentially SKH's student, likewise with RVD. This is essentially a universal axiom. You would test where you train, or if you "crossed over" similiar organizations (ITF vs. WTF, USAF vs. ASU) there would be some 'feeling out' of that student before any promotion. Remember, that video testing, also somewhat gives that examination board a cross section of your progress over the years, and showing up for your in person Shodan that examiner should ideally have a sense of who you are. Not just a guy who wants a Bujinkan shodan but with a TSD background. And I would be even more hestiant with 2 posts to ask a guy with 5000 posts what his background is. Maybe that is just me.