Older Music Slowly Returning?

[¿Mukuhawku?]

In BW 23, TR used their Diamond and Pearl motto theme. Then, in the past few episodes, a remix of "Team Rocket's Secret Strategy" from the original series has been used often. Now, in today's episode, the M13 version of "By Your Side (Hikari/Dawn's Theme)" was used. Is this a sign that the older BGM could be making a comeback?

 

[Iteru]

We've had tracks from the Arceus movie in Best Wishes before the 23rd episode and other previous tracks too. It's not making a comeback if it was already there, so I've closed the thread.