Its up to the Als how they want to allocate their TC spots. Best case scenario is all three of those guys come to camp in shape, win roster spots, and contribute during the year. At worse, neither makes the team. But even if neither makes the team, having them around offers some advantages. Younger guys can learn from Parker who's been successful in the league. IMO Parker probably has the best shot at sticking, and the Als have shown they are willing to play a vet (see Hebert, Kyries). Having Bruce around may push the vets some and prevent them from becoming too complacent. I think he's probably the longest shot to stick as he is not likely to displace Richardson or Green at either of the top 2 slot back spots. At his best Bruce would be no better than their third best receiver.
As for Porter, he is getting a bit of a bum rap IMO and people are writing him off for the wrong reasons. He's got a bit of an arm and he can run. Has he developed into a starter during his time in Hamilton? No. But I wouldn't exactly point to Hamilton as being a hotbed of QB development. Danny Mac spent a long time as their starter in the last 20 years but he started as a back up here in Wpg, another 2 years as a backup in BC (yes 5 years total as a backup!), then 1 year as a starter in BC and 2 years as a starter in Edmonton before heading over to Hamilton. They've gone through Kevin Eakin, Printers, Timmy Chang, Porter. Glenn and Burris came from outside the organization. And Porter has had basically new coaches each of his years in the league which doesn't exactly help matters. The obvious comparison will be Calvillo blossoming after moving from Hamilton to Montreal. But they've also managed to turn a guy who has barely played in McPherson into one of the hotter FA commodities in the league. The Als lose nothing to see if they can resurrect some of the promise the 2008 and 2009 season Porter flashed in his time on the field. If they can't, they have an eraser - "Porter, you're cut, thanks for coming out". And frankly, Porter may not even make it to camp. I think a lot of that will depend on who is hired as HC and their preferences. He could be expendable if the incoming guy what's a different skill set. Say they hire Lapo - would he prefer to bring in, say Joey Elliott with whom he is familiar with already and may know his system better? If they hire Rene Chapdelaine for instance, could he convince Reilly to back up Calvillo for one year with the promise he'll get to take over next year? Still a lot to play out.