I've gained back some limited movement. I can play guitar again (Win!), but I still do not have the dexterity built up again (Fail.) Hopefully I'll regain more thumb strength back soon, and I'll be able to solo again.
My splint was taken off yesterday, but I still can't use the thumb. It's very swollen, and I have limited to no mobility, and I've been told to keep trying to move it to regain strength and movement.
Unfortunately, I'm not allowed to do any resistive tasks (holding objects... video games... guitar... żleft handed fapping?); If I do any resistive tasks, I run the risk of ripping the tendon apart again.
So yeah, I don't really have my thumb back... It's more of a sausage that's stuck to my hand.
I'll update again in a few weeks with my progress.