Well we've been 3 manning it and tonight we reached a certain island. You can't rely on having Sandara you will lose her (though possibly temporary) at the island so you need you your own healing. Unfortunately we had no healers as one of our players was planning to get there later (I'm usually the healer and had gotten sick of being the healbot every time so hoped someone else would step up)
The same island has very tightly knit encounters of levels that are quite nasty so you want some good healing and again trying not to spoil you need some blaster as well.