Will leaving behind a small amount of glandular tissue after gynecomastia surgery become a complication?

I understand that the purpose of leaving behind a small amount of glandular tissue helps prevent crater deformities. But wouldn't that small amount of glandular tissue still be a complication in terms of preventing a flat chest as a result? I see that fat grafting is a frequently suggested alternative after complete removal of gynecomastia tissue. And I would like to avoid going under second operations. Should this be something that most surgeons can do under the same operation of gyn. surgery?