Ziggy has certainly gone through a LOT at such a tender young age.
I know that aspergillosis can negatively affect their ability to talk. Was he tested for asper the last time you had him into the vets?
It's difficult to say if he'll talk again. The fact that he once spoke makes me think that he will again one day.
My Ziggy is now 1 year and 9 months old. I weaned him from a baby. He first said I love you at 3 months old. Then dirty bird and I love you in the next few months. He then went through a few rounds of antibiotic injections 4 pseudomonas, then ecoli. He stopped talking at that point which was about 6 months old. Does anyone think he'll ever talk again?