^^Because they aren't just going to keep building coasters until that's all they have. They know that the GP likes a good log flume, and they had been without one for a couple years. Since Maverick, they've been concentrating on a wider range of people, with Planet Snoopy and now Shoot the Rapids.
If they go wood, any of the current manufacturers would be a great choice. They all make smooth, reliable, exciting coasters. Wooden coaster manufacturing is at an all-time high right now, with everyone at the top of their game. Regardless of who they choose, the next woodie at CP will be quality. In my opinion I just don't think it'll be GCI, because I don't think a GCI would "fit" at CP. CP is a park that loves to push how fast their coasters are and how much they push the limits, and despite the fact that GCI's are fantastic coasters, they don't push any limits.