To answer your question, I will need to get into my time machine first, (courtesy H.G. Wells), and go to a few games in 1918.
(IMHO) Whenever one measures a team for its greatness, you never get a definitive answer because stats can be expressed any way you want.
In addition, the more subjective areas of sportsmanship, leadership, teamwork, unselfishness, chemistry, etc. cannot be measured except against one's own personal standards for sport.
Anyway, I liked your question. Let's hope that this year's team will be the subject and winner of your and many other fans' "greatness" discussions in the years and decades ahead!