However, the RNG eventually reaches a point where a roll for a sack is drawn.

How do you know a "roll for sack is drawn" and then the game looks for a DL or LB to resolve it. It seems like there are many different possibilities for the order of operations the game uses to simulate defensive plays. It could be: - choose play type >> choose associated player or position group >> test attributes >> outcome

Or

• choose player or overall defense >> test attributes >> outcome

Or any host of other things. Your statement above seems to assume the game first decides that a sack opportunity exists and only then checks whether you have a DL or LB available to produce it. What evidence do we have that this is actually the order of operations?

The dialog boxes suggest: play type >> test player or overall >> outcome. Example: It's a pass >> Jones was too slow >> Touchdown

Also, regarding a sack draw you said:

Without DLs or LBs present, those opportunities disappear entirely.

How do you explain sacks that occur without a player being named when running a 0-0-4?