How old is Sully.Young grey tiels look like girls untill around 9 months or so and have a molt.It does sound like male behaviour you discribe but all are individuals.I would need a photo to be sure. Female tiels are usually quieter,less vocal and the males are very vocal and lively,strutting along a perch and it is said the females dont talk.My old female never talked but both the males did,very well infact.