Remember Man CIty will play many competitions. For example UCL, EPL, FA, and EFL, so the more player options Guardiola will have the easier it will be to rotate. The wagons are also still proving to have a good role in the ongoing club world cup. Maybe a 1-year contract is good. Man CIty may not want to let Gundogan leave for free. I'm sure there are still many SPL teams or American clubs who want to sign him if he is sold by Man City in the middle of next season.