Hopefully others here will give you better advice, but there seems to be a lots of "ifs" with this bird. Sounds like if you got him, he would be in a cage 24/7, that is not in the best interest of the bird. They really need freedom out of a cage. Such as a big aviary.
As for the tail feathers, only a vet can give you the answer you need. Parrots that are kept cages all the time, will pluck as those conditions will stress them.