@Jojojazz89 hi Christina and welcome to Type One Nation.
Sports are great and it is very important for your son to continue, not just for the exercise but for fitting in and proving that this disease changes nothing.
I get your fear, but please arm yourself with information. Please consider working with a CDE to get the right nutrition and strategies for sports, studying, and everything in between. In 10,000 hours you will be an expert and this will not be as new to you - but for now you have some studying to do.
He’s probably begun to mke insulin again and it is common to reduce and sometimes go off insulin for weeks or months right after you start. This is called “Honeymoon” and while a stupid name, just means his body will make insulin for a little while. Diabetes is not going away, so please trust that this is temporary.
The CDE can instruct on how to reduce long acting insulin and meal insulin for days of vigorous activity, and it doesn’t matter pump or pen(shots) it’s the same thing. Unlike other diseases, diabetes forces you and your son to make the primary medicine decisions - while that may seem scary, you will be an expert with practice.
A pump and CGM may limit his ability for wresting, or probably get in the way. There are accommodations for wrestling but if he puts a pod on his shoulder and the CGM on his waist… they might not let him play. "reasonable accommodations” are mandatory but for HS wrestling, he cannot change the basis of the contest - he can’t have “no touch” medical protrusions where the opponent is not allowed to grab him by, for example.
The next year will be a learning experience for you both - I’ve had T1 for 40 years now and it’s a pain in the ass (pardon the pun) but it becomes background noise to the things in life that are really important.
Please let us know how you and he are doing. Please consider the book “Think Like a Pancreas” for self-learning and do not forget to take care of yourself.