[raz]

I just want to point out the sides of his legs. There is a zordbuilder port on the top and another hole below it. On Gozyujin, his leg rotates around for the side hole to be pegged into by the arm port into the leg.

The Q-Rex Megazord has a hole in the same place on his leg, but there are also slits on the top of the leg, meaning it possibly is able to be completely detached, as expected with the Zordbuilder functionality of most Megazords lately.

My speculation? The legs detach from the body and attach to the arm port via the side zordbuilder port on the leg for Gozyudrill.