Preseason? You're talking about preseason like it means something? Keeping McGuire over Bennett doesn't really mean anything unless you're talking about Bennett's preseason work and then I go back to.... preseason? The only thing Bennett's done well so far is play special teams.
The coaching staff choosing Streveler doesn't make them infallible. Quite the contrary. Look at all the young QB's this coaching staff has believed in and you'll find that Streveler is the only one to have done much of anything and he wasn't quite ready yet to be a starter last year because of his passing. The ratio of good to bad young QB's this coaching staff believed in doesn't work in their favour.
Were not Calgary. We trade for or pick our QB's up in Free Agency. The Bombers brought Danny McManus (1990) and Dieter Brock (1974) into the league over the last 45 or so years. Even then, we didn't get the benefit of having Danny Mac as our starter. I'd say the Bombers track record of bringing young QB's into the league is abysmal.
Yes, we're Grey Cup champs, but we were also 3rd in the west. We made a huge trade that worked out perfectly for a vet QB in the last hours before trades closed last year. If the coaches thought McGuire was ready to play then, we wouldn't have needed to make that trade and we wouldn't have likely been GC champs.