She might've been on the Al Bhed team before she scampered off to go help Yunie?
Also, checking the FF wikia, apparently all of the Gullwings can play Blitzball in FFX-2 in Ch5 in Luca. So technically Yuna should get Blitzballs too.
Rikku also uses a Blitz Ball in Blitz Ace potentially, being the one who serves it to Tidus' Sphere Shot...if she's got the highest relationship. Lulu and Yuna are the other alternatives; I think this and the Al Bhed speedster scene (whether you get Rikku or Lulu) is the extent of FF10's hidden relationship values outside of possibly an occasional line of dialog; nothing on the same level as FF7's date (...which is to say, no, you don't get the opportunity to date Auron)
Regarding Terra on Banner: Djinn, she literally just had her BSSB on the previous banner! Besides, Terra's the last FF6 character that needs any sort of love in this game; god only knows she's gotten more than her fair share. Predicting them to release a "Heroic" skillset which is given to protagonists only to counter "Darkness" for Villains, because oh look, it CONVENIENTLY buffs Terra, Cloud, and Cecil (3 characters they like to favor) without being blatant about it!
...and yes, Snow would 100% get this skillset, despite not being a protagonist. I thought THAT was obvious!
ON A DIFFERENT NOTE: Beat Ultimate Yunalesca w/ Mastery. Various failed attempts until someone told me Mega Death is only a 5% chance in phase 3 and instead opening with it, she Hellbiters again. Ok, now restoring Sap with HotF suddenly seems like a VERY good idea, since nulling out Holy entirely and not having to worry about Shellga being dispelled by Counters outside of Mind Blast, so I just have to hope she doesn't use a 5% attack in about 10 turns or whatever it takes to gun down half her health. She did use MEga Death on the winning Run! ...right after her Phase shift Hellbiter, so no problems! Other things to keep in mind was "use Hymn after the 2nd Hellbiter in phase 3, which is her 7 turn cycle one", and "Hold off on Sentinel Grimoire until Phase 2."
I also did get hit with Mind Blast, but damage was mild and only Auron and Yuna got confused, and Tyro had a turn coming up so Tyro pokes Auron and all is good (Yuna was basically useless at this point)
Team Set Up:
Tidus: Brotherhood, Genji Helmet (FF6), FFX Power Gloves, R3 Dismissal, R4 Armor Break, Soldier Strike.
Between Dismissal hits for stun and Armor Break for slight damage boost, he's just there to do damage mostly, having Realm Synergy, a Synergy weapon and an actual Soul Break (which matters more than usual thanks to Osmose).
Auron: Shimmering Blade, Crystal Armlet+, FFX Power Gloves, R3 Pound, R3 Double Cut, Bushido
More damage with Synergy and such, a Soul Break for late damage which also lowers attack, and he's level 65 w/ Synergy to boot. Double Cut w/ Planet Protector did over 5k a hit, so yes, easily the best damage move Auron had.
Vaan: Heat Lance, Holiday Mittens, The 4* FF10 Attack Accessory, R3 Magic Breakdown, R5 Tempo FLurry, Freedom's Wish.
Mostly just worked well with being a character who could use a Synergy weapon, high leveled, Magic Breakdown, and Tempo Flurry being R5 makes a bit deal with Osmose. The Mittens were there in case I needed another attack boost after PP #2 wears off.
Yuna: Lullabibble Rod, Mystery Veil, Some Defensive Equip, R5 Curaga, R2 Shellga, Mako's Might
Pure Healer with Shellga for added insurance. Mystery Veil originally was there for MT Healing that didn't undo sap until I learned about it, and then too lazy to swap.
Tyro: Aevis Killer, Edin's Coat, FF10 Power Gloves, R2 PRotectga, R3 Power Breakdown, Dr. Mog's Teachings
Shield Grimoire; everything else is mostly filling gaps for other characters, but Shield Grimoire was the reason I brought him.
RW: Planet Protector. Should be obvious based off descriptions and given the team, I think it's clear why.
Also, this fight made me come to the conclusion that the Lullabibble Rod is the best Relic I ever got from a Lucky Draw. It's competition if you're wondering is Lightning's Blazefire Sabre, Garnet's Storm Staff, Squall's Shear Trigger, Rinoa's Rising Sun, Auron's Shimmering Blade and Tidus' Brotherhood. Won't deny that the Shimmering Blade at least TRIES to put up a fight though