Heavy:
*Masaji Kato (SH2)* vs Elieen (S1) - I don't know about other people, but I see the Gem/Sword/Mirror as legal for Kato. They're not much different than, say, Yuna's Aeons, Lady's Umbral, or, as a lesser extent, Ultimecia and Guv's Call Team. They've already been killed proper before this battle, and it's pretty solidly Kato's will that summons them there.
That said... If Eileen tries to EQ them away, she leaves herself open to a Howl. If she goes for CF, she leaves herself open to dispel from the Gem, and THEN a Howl.