One of the stories about Henry Burris' retirement reminded me of the Stampeders' QB roster in his first CFL season (1997): Jeff Garcia, Dave Dickenson and Burris. Two of the three were still unproven at that time but went on to have great careers. In terms of raw talent, I would consider them a great QB trio.
A couple of others came to mind:
- Edmonton 1987: Matt Dunigan, Damon Allen, Tracy Ham
- Toronto 2013: Ricky Ray, Zach Collaros, Trevor Harris (still very much TBD - we'll know in 5 or 6 years)
Any other trios belong on this list?
I think the key is the third guy. There's no shortage of great duos with a third stringer lost to history. (e.g. Jackson, Lancaster and ____? Clements, Holloway and ____?)