Forum:Dragon Master Knight special summon confusion

I read the tips on Dragon Master Knight and the third passage states that "The Light-Hex Sealed Fusion" can be used as a substitute for Blue Eyes Ultimate. "The Light-Hex Sealed Fusion" then says that you can special summon a Light Fusion monster by tributing the necessary cards along with The Light. You don't need Polymerization. Then I read the first sentence of Dragon Master Knight and it says that you can only Special Summon it by Fusion Summon. Doesn't that mean the only way to get it out is if you Fuse Black Luster Soldier with Blue Eyes Ultimate, or is The Light's effect legal for Dragon Master Knight?