*"I'll borrow the power of darkness."* part most probably means Juggler miss Gai and already let go of his jealousy towards him not being chosen as Orb back in the days. Well their rivalry has already done even in Orb series alone. Which is why it is probably a call back to his only friend and rival like how Gai said in is fusion transformation *"I'll borrow the power of light"*
2:37. Juggler: Well, looks like it's pretty much trashed. At least Premium Bandai got their toy variants like the last time. The Dark Ring can stay where it is, but those toy sales were good.