Tier visas are different from settlement visas. Be careful if you read other posts on the Visas board, because most of the people who post here are applying for settlement visas, and are able to use third party sponsors. There is no third party option for Tier dependents, and the rules are very strict with no allowance for the ECO's discretion. Your fiance must hold the required funds in his account for 90 days, and must have solid proof that he has done so, or the application will be refused. Since you say in your original post that you are not planning to get married for a while, perhaps he will be able to set aside the necessary funds and keep them in a separate account for three months?