Per the current Oracle text and L5R rules, if my stronghold is Temple of the Ninth Kami and I equip a Guardian's Blade, it will gain the +3F bonus (even if I don't control another Temple). Correct?
Guardian's Blade out of Temple of the Ninth Kami
A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
Correct, Temple of the Ninth Kami counts as a Temple under your control.