A comet predicted to light up the sky in 2024 may already be doomed

I would have appreciated some more science in the description of Dr. Sekanina's "three main reasons that he believes that the comet is all but finished." There is a colon after that sentence, but then the story switches to how well respected he is and what others disagree with him about. Was something edited out of the story? Readers seem to have to glean from the disagreements what Dr, Sekanina's data and logic are that support his conclusion.