Changing the question to greatest individual play,
by Homeboy73 (2019-05-11 00:28:18)

In reply to: What do you consider to be ND’s greatest play of all time?  posted by Frank Drebin

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so not necessarily in a huge game. Bob Crable leaping to block a University of Michigan field goal? Ivory Covington (maybe 150 pounds) stopping the Army tight end going for 2 points and the win at the end of the game at Giants Stadium was amazing. Samardjia’s catch and run to win over UCLA. Numerous flattened QBs by Patulski, Ross Browner etc. Pretty much any kick return by Rocket. Lots of great memories.

Zibby PR vs USC in 2005 should be mentioned *
by BillShakespeare  (2019-05-12 14:37:16)     cannot delete  |  Edit  |  Return to Board  |  Ignore Poster   |   Highlight Poster  |   Reply to Post

Allen Rossum chasing down the navy player
by naptown  (2019-05-12 11:02:09)     cannot delete  |  Edit  |  Return to Board  |  Ignore Poster   |   Highlight Poster  |   Reply to Post

And tackling him just short of the end zone to preserve the win and the streak. I was living in Annapolis at the time and watching that with a bunch of Navy fans.

Ivory Covington's *
by MukIrish  (2019-05-11 16:29:30)     cannot delete  |  Edit  |  Return to Board  |  Ignore Poster   |   Highlight Poster  |   Reply to Post

Ross Browner batting down the pitch in Cotton Bowl,
by Notra_Dahm  (2019-05-11 09:42:50)     cannot delete  |  Edit  |  Return to Board  |  Ignore Poster   |   Highlight Poster  |   Reply to Post

and beating the running back to the ball as it bounced around their backfield. Fairly early in the game, if I recall, and really gave ND momentum.
It could be argued
by D8NDomer  (2019-05-11 09:40:33)     cannot delete  |  Edit  |  Return to Board  |  Ignore Poster   |   Highlight Poster  |   Reply to Post

Nick Eddy's kickoff return against Purdue in '66, after Leroy Keyes had returned a fumble, established the winning spirit for the team. Had Nick not made the play and Purdue built on their lead the psychology would have been entirely different, not only for that season but perhaps for our perception of Ara.

Of course ND had the dominant team, and the entire special teams unit was responsible for the play. I've never seen a more wide open sideline to run down. I was sitting just above the tunnel and clearly saw the play develop.

So, it is all speculation; as the question invites.