The Cybele and Aitvaras trailers put us well past the halfway point when it comes to SMT V trailers.
Meanwhile, Aitvaras is a new dragon introduced in SMT V. While the character is new, the video shows it will know familiar abilities like Maragi+3 too.
The SMT V video for Cybele showed up first.
Which means the October 4, 2021 trailers serve as a means to see how Cybele will work when she shows up in SMT V. It also introduces a new character.