Thanks for all the info, FortMax! You're a real credit to this fandom. As someone who is a videophile and always wanting to keep the original quality of a video preserved, knowing this kind of info not only helps but challenges me to do a better job at spotting the different ways videos were produced.
Toei may be trying to hide Blade's SD. On the Toei Video page for it (http://www.toei-video.co.jp/DVD/sp21/blade.html), there's no mention of it coming from an SD like for the Ryuki and Faiz sets. Confused me until I YouTube Blade (definitely filmed on what filmed the other two).