Once I got open crystarium I got Sazh cure and dropped Light, otherwise I'd have her in.
I play very defensive so Snow was a better sentinel(and had ravager), and the other two have defensive synergist, Sazh with the bar and Hope with bar/protect/shell, and both have medic now, so that's why I use those three.
Been roaming around Pulse completing missions, some good, some not so good.
Also, I've noticed a couple of cosmetic glitches recently, sometimes when there are two of one type of enemy, it'll show Sazh pointing his guns at one, while the bullets actually go for the intended target. The other is sometimes it'll call steelguard mediguard, the title will say mediguard, but Snow glows yellow, no regen, and damage steadily reduces.