Regarding the side argument of of what is a comeback, a comeback involves tying or winning, not coming close. Coming close is a "late surge" or "comeback bid that falls short".
http://en.wikipedia.org/wiki/Comeback
http://www.merriam-webster.com/dictionary/comeback
It could be argued that neither the SNES or PS3 made a comeback, because they were not in a lead, lost it, and returned to glory. If we use the sports reference, SNES made a comeback because it was losing at the begining and won at the end. The PS3 did not make a comeback as it is still losing. At this stage we would call it a late surge. If PS3 sells another 30 million or so and eventually leads the generation, it will have a completed a comeback, and it would probably be considered the greatest comeback. As it stands right now, SNES is the only comeback winner by any definition, and as such is the greatest comeback winner.
