Run/Pass Stuffs are individual tackles behind the line of scrimmage, excluding sacks. They do not include plays for no gain but do include forced fumbles on those plays.
The TFL (Tackles for loss) stat used by the NFL/NFLGSIS does not include forced fumbles and only counts solo and lead tackles, not assisted tackles.
Our stat includes assists which is the way Stats, LLC (not called Stats Perform) scored them from 1992-2020. However, we add in pass plays that go for a loss, which Stats does not. In 2021 Stats added in plays for no gain and we did not adopt that practice.
We think this best captures the "splash plays" involved behind the line of scrimmage. One can easily add sacks in for Sacks+Stuffs. The NFL's TFLs exclude forced fumbles and as mentioned do not include assisted tackles or half-sacks.
That said, here are the leaders through week 14 of the 2022 season—