And if TEFL -qualified China-seasoned teachers without degrees had taught at your summer camp
how do you think they would have measured up to 'proper' teachers from home? That would
be interesting to have your unbiased opinion on.

Not certain of your meaning, OBJ.
Degrees have no bearing on one's ability to teach, providing the teacher has ESL qualifications. What does a degree in ballroom-dancing or origami have to do with teaching/babysitting brats?