I feel the OP's pain, and wish them a full recovery. I had a crash on May 28th, just me, resulted in 3 fractures in my neck, 2 broken ribs, and a messed up right shoulder. My neck is doing okay, stiff and sore, having started PT this week. My ribs are healed. My shoulder still has issues. It is protruding to the front, and has an elevated big knot at the rear top of the shoulder. I am seeing an orthopedist Friday, the 9th. I suspect either a torn or detached tendon, or maybe a displaced clavicle. It is very painful with most movement, always sore and stiff. I am soon to be 72, riding bikes for 65+ years. This was the first time I had serious consequences from a ride and fall.
It certainly could have been a lot worse. The ER had me transported to a trauma center, 90 mile ambulance ride, due to the neck fractures being unstable. It was determined at the trauma center that surgery was not necessary, but I wore hard shell neck brace 24/7 for 8 weeks. My shoulder was so swollen and bruised that the deformity of the shoulder could not be seen. X rays showed no fractures. It took a long time for that swelling and bruising to reduce enough to see the deformity. Likely going to need an MRI to determine the actual damage.