Looking at the sword and shield more closely, it looks like the shield separates, and I suspect it connects to the sword as wings to become a phoenix mecha. You can see a head on the hilt, the the tip of the sword looks like tail feathers.

That is what I am thinking as well, it is hard to be sure because the images are still blurry

My assumption is that the sword and shield combines and then grows to be Gigant Houoh/its rocket form.

An interesting fact I learned is that the Cerberus constellation is not called Cerberus anymore. Now most of its stars make up the Hercules constellation.

Then if they do something similar with the mecha it forms like I did with mine, Hercules would be part of the name.

This is rather nitpicky, but the Cerberus Voyager is a remold, not just a recolor. It's clearly been altered to have the three signature dog heads, whereas if it was just a recolor, the most they would've done would've been to paint dog heads onto the areas above the front paws, and try to pass off the lion head as a dog head.

The Saiko Kyutama has the number 315. Does anyone know the significance of that number?

^ It's a pun. 3-1-5 can be read as "saiko" (sa-i-ko).

An interesting idea I heard suggested about the Orion is that, rather then being an upgrade for Shishi, its an entirely different ranger that simply takes control of Shishi's body. That really reminds of of Shirogane from Justirisers. What a unique idea for a 'powerup'.

That's interesting. I expected it to relate to something with space, but I guess it's simpler than that.