Back Issues #4: Waning Moon has made the people look into to the current 1-star and 2-star champions they have in the roaster. There aren’t so many 1-star champions you may have. I got just 7 to be honest and Colossus is one of them.
If you look at the 1-star Colossus Specs, you will realize that it is still the old one. Did Kabam Forgot? Not really. They just don’t want to buff a 1-star version of the Colossus. Kabam has already confirmed this.