I'm confused. I was looking at some rulings (yeah, I was looking at rulings !), and I came across the ruling (an official one, I believe, from UDE's Specific Card Rulings) that XYZ-Dragon Cannon can be Special Summoned by Dimension Fusion if it is Special Summoned "properly" (with an AARJ ruling clarifying it as "properly through its effect." How can this be so if XY-Dragon Cannon, XZ-Tank Cannon, and YZ-Tank Dragon's rulings all say that they canNOT be Special Summoned properly (since the only proper way to summon a Fusion monster is by Fusion) and that they cannot be Special Summoned by Monster Reborn because of this? Isn't this essentially the same basic situation? Why is the result different? :?