I think I cracked the code.
If we are going for a 13 episodes format, then I guess the order of focus would follow the order of the ending like this.
>1. Special Week: Ep 1, 2, 3, 4, 5
>2. Suzuka: Ep 6, 7
>3. Vodka: Ep 8
>4. Scarlet: Ep 9
>5. Gold Ship: Ep 10
>6. Teio: Ep 11
>7. McQueen: Ep 12
The final episode would probably be Japan Cup with Suzuka recovering and run together with Special Week.
When a horse girl's character song is used as the ending, it means their arc is over. So far after episode 5, where Special Week won her Derby and her character song is used, we don't see her running for a full episode afterward. And as you know, with Suzuka's current status when her song is used, she won't be running anytime in the recent future. So it should be following this order.
Any thoughts about this?