Letting him enjoy the sunshine is a wonderful idea. When Pidge first came to me after all she went through, my instincts told me to do the same thing. I didn't have an enclosed area, so I held her on my lap while I sat on the patio and she never tried to get away. She just purred and purred and ate it all up. I do so hope that Tiger gets to enjoy soaking up the sun and that you get to enjoy lots more quality time w/him. I'm so glad that he can breathe better.