Just-to-Buy does not, absolutely not, want to be affiliated with any kind of extraterrestrial beings interested in learning any sport played on Earth, especially not one he is good at. He still has daily nightmares of the horrible scenes from the documentary he watched when he was a young kid about how a bunch of E.T. came to Earth and targeted the most famous basketball stars with a similar scheme. There is no way he will get caught the same way and have all his talent stolen to make super hockey players aliens, for them to compete against a bunch of colorful animated characters in a game that will decide the fate of these beloved characters. The only thing that saved them last time around was a "retired" basketballer who for some reason was playing baseball that season, but there's no hockey player currently away playing another sport, so if we help the aliens and they steal our talent then all will truly be lost.