Mk 5 CEC Fusion Furnace gear help

So I got one today, but deciding on who to put it on, all my big characters need it. Arena is Rebels team hanging around 100, GW is completed with Sith team daily. Thoughts?

Leia, STH, Lando, Rey & Dooku to gear 9.
Wedge to 9, but still need Mk 5 Stun Gun
Maul to gear 10, still need Mk 6 Syringe to complete gear 10, maxed out except Zeta which I am working on.

Thanks for your input.