Found this and thought it was worth posting for now.
It says a showcase for professional football players CFL/NFL wanting to get another opportunity. Only 4 teams
Only NFL/CFL General Managers can register for player info and film.
Also said teams can register up to 20 players so this sounds dangerous. Is this a way to hide players or lengthen the preseason? Timing looks right
Could this be another talent source? Is it an extension of the practice rosters? Should the CFL teams get involved?https://www.thespringleague.com/nfl