[Den-O]

You can easily snap Pteragordon on the back of Kyoryuzin when using the Bragi-backpack as the Zyudenchi cannon. The thing is that the only way to stabilize Pteragordon, even in the Raiden Kyoryuzin combo, is by using Gabutyras yellow tail piece. It rests on the ground and balances the whole combo.

In this combo Kyoryuzin stands on the legs of Bragigas and winds up being about 2 or 3 inches higher off the ground. And the yellow tail section is used as a part of the combos helmet. At which point there's nothing to hold Ptera, making it all the more likely that the clips on Gabutyra's back will break. I can't see any logical way to attach it that won't increase the risk of breakage.