Yes, there is a very real risk. When a teacher substitutes into the partnership, the point remains to. assist something being developed in the partnership. But when competing with the teacher becomes a goal, you are likely to each embark on private projects with your teachers that your partner won't (and quite often shouldn't) be in a position to support when you dance together. Some of that will simply be to take advantage of the pro's capability, but some will also be that pro-am can (not always, but easily) become a bit over-the-top with certain aspects of dancing ending up out of natural proportion to others.