How is frozen shoulder like posterior tibial tendon dysfunction? Why me!!!

I am presently rehabbing a right frozen shoulder that developed following a stroke I had in August. The image above shows the amount of balls I made (6) and missed (many) from 20 feet as I try to get my strength and accuracy back. Possible?  I ignored the pain for some many months and now I am paying for that mistake. I have what would be equivalent to posterior tibial tendon dysfunction. My weakness was caused by my stroke, and then the shoulder joint began to gradually shift out of position with the stronger front muscles to the weaker back of the shoulder muscles. I wish I could make an orthotic for this injury like I do for the foot injury. Oh well. Since this will be a regular game to check my progress I will send updates. Rich