There are already some Stunfest videos in youtube. I posted 3 in Video thread. Is Iori, Kyo, Kim and Athena fest, as usual.
Just watched last half of the first video you linked, ryo's combo is 3 stocks and it ends like this B+C, sC, qcf+A+C, hcb+B+D, DP, ranbu
You could do a 2 stock version for less damage but still decent as your cancelling inside max mode to save a stock. It's B+C, sC, hcb+B+D, DP, ranbu.
Watch the video at 12:12, Ryo does the combo. He finishes the combo using an EXDM, but because the maxmode ended early he could of chosen to use just a DM if he wanted right?
Whilst if he was in maxmode still it would of been an automatic EXDM.
So basically you have to know specifically what combo's are going to use what amount of meter and then you have order select to consider. This games getting complicated.