This is theorycrafting but having a level 13 with 4x level ones will slow down there progress i think as its taking away from their xp and a group of 5 kills low level mobs almost with one shot anyway. You could do them as a group of 4 until they catch up as that will be more xp shared amongst them. Having a level 13 will have some money to which can help you get a bunch of bags for all of them faster. I you could level them all singularly through the starting zones maybe.
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