All babies will 'comfort suck'. I'm a BFC too, and FWIW (no research, though), I think you're right about it being about suckling at night being protective, rather than about the dummies.
We need to stop differentiating between 'comfort sucking' and food sucking.
The fact is, when a baby suckles, it releases a huge cocktail of hormones that includes stuff that makes them sleepy, makes them feel loved, strengthens their immune system, kills pain, removes fear, regulates their hormones, most importantly (wrt to the SIDS issue) regulates their heart rate and breathing rate. Of course, it also stops them being hungry or thirsty if they are suckling at a breast.
The point is, that a baby, especially a newborn, does not have any idea about hunger being any different from any other form of discomfort. All it knows is that it feels 'not right' and it's instincts tell it, quite rightly, that nearly all the 'not right' feelings will be sorted out, one way or another, by suckling at the breast.
He'll get warm if he's cold, cool down if he's warm (because of being close to mum), filled up if he's hungry, less pain if he's got pain, go to sleep if he's tired, stop being scared if he's scared, calm down if he's got cross...it's all good.
IMHO, the differentiating between comfort sucking and food sucking is one of the biggest (apart from poor latch) blocks to successful bfing, because we're so nervous of feeding as frequently as a baby actually needs to. We don't believe that a baby can actually self-regulate when that's what they're born knowing how to do. But people have been scared by all the stuff about spoiling a baby, or foremilk and hindmilk (which doesn't actually exist), or breasts having time to re-fill (not as simple as that), or babies getting too much milk etc. etc.