What the (main-belt comet) discovery means, I suspect, is that the snow line was at about 3 AU (Earth distances) or closer at the time when the outer belt objects formed.

Cold in the earth - and the deep snow piled above thee, / Far, far, removed, cold in the dreary grave!

We've identified a new type of object that by the shape of its orbit is definitely a main-belt asteroid, but by its appearance is definitely a comet. It fits into both categories.

For as the rain cometh down, and the snow from heaven, and returneth not thither, but watereth the earth, and maketh it bring forth and bud, that it may give seed to the sower, and bread to the eater: / So shall my word be that goeth forth out of my mouth: it shall not return unto me void, but it shall accomplish that which I please, and it shall prosper in the thing whereto I sent it.

I used to get spanked. Yeah, my mother used to line us up and we'd get it with the belt. I think she was into music, cause we were all different sizes like a xylophone. But I've been through therapy, I'm OK now.

When I was as you are now, towering in the confidence of twenty-one, little did I suspect that I should be at forty-nine, what I now am.