"The findings settle ..." - well, they do not. And science does not work quite that way - rather in a sentence
above: "... was likely formed by an enormous comet ... suggested ... " is a little better.
We should also bear in mind that while Philae and Rosetta will relay to us much more detail about comet 67P Churyumov-Gerasimenko than we had previously known, it is detail about ONE comet and we have much to learn about how this fits into the general picture of our solar system. We know that there is much variety in composition among comets and even in the same comet - spatially, comet Hartley, or temporarily, comet Hale-Bopp.