So I'm going to name a few Cats and give a percentage of them being on the roster on Opening Day. Note these predictions have nothing backing them but my own somewhat delusional feelings.
Kevin "You Disrespecting Me?" Glenn 50%
Before the Argos Eskimos Ray Jyles switcheroo, I would have said higher. Theoretically the Cats could trade Glenn, but who would take on his salary? A hearty Bad Boy "NOBODY!" Glenn could stay just because the Cats don't have any real options when next rolls around besides Porter. Or the Cats could outright release him. Cue article about Glenn feeling disrespected.
Quinton "Give Me Another Chance" Porter 55%
If the Cats cut loose Glenn, in theory they could be handing the starting job to Porter. Problem is Porter hasn't really done much to deserve. Sure he's better than Cleo "the Party" Lemon, but that's not saying much. If Porter had a whole season of starting, the Cats might be a 500 team, er just like under Kevin Glenn. Porter probably does have some trade value and was arguably the best backup quarterback last year (although the competition wasn't very fierce).
Simeon "the Red Animal" Rottier 20%
Free agent and wants to be near his family apparently. The Cats could make the guard an awesome offer, but non-import guards aren't that hard to replace. Wasn't the plan for him to play as tackle eventually?
Avon "the Tweetmaster" Cobourne 50%
Did an OK job in 2011, but not good enough to inspire his own headgear. Didn't do a lot in the playoff loss to the Bombers where he should have been more useful. Good as a receiving running back and would be better at that than whoever the Cats would replace him with. Big salary would be the main reason for the Cats to cut him and replace him with Terry Grant, providing he heals from his injury.
Aaron "I'm a Tall Receiver, Somewhat Slow" Kelly 30%
Probably comes to camp next year, but gets replaced by a couple new import receiver flavours of the week who show stuff in camp and proceed to drop a lot of balls early in the regular season.