Hello, I asked in regards to the Minato Hokage issue. Minato Hokage only uses his secondary mystery when the targeted opponent suffers from tag, which is different from irremovable tag. Irremovable tag will not activate this mystery. Regarding the damage aspect of Edo Tensei Tobirama's irremovable tag, we are testing that right now, and I will update you if we find anything.

Edit: After testing, the damage aspect of irremovable tag is working correctly.