A disciple of taijiquan is not an ordinary student.
By definition, a 'disciple' follows and disseminates a teaching. In this case; taijiquan.
The keenest students will be asked if they are willing to make the commitment to
learn everything the instructor has to offer.
Are they prepared to work harder than any other student?
Are they willing to be pushed harder than any other student?
This what it means to be a disciple.