Should I put it back?

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Last time I got a big problem about my gold fish. Out of 10 diseased fish, only 1 left. I though he cant made it too but its almost 1 months since hes been affected, hes whole mouth is gone caused of the white spots he has before. The white spot from hes lip got bigger and bigger, looks like the spot erased his whole mouth but didnt reach the eyes of the fish, if your going to see the fish face to face, only a big hole you can see to him. Looks like he turned like a fish monster, but sad to say I feel bad too for him, coz he cant eat or cant be with other fish, I separate the diseased fish from others which is not affected. So now, its almost a month i can see to him, hes wroking good. hes half of mouth or half of hes face getting back and the hole is getting smaller but still hes not perfectly healed, he can even eat a little now.... Do you think I can bring him back to the place where he can feel more comfortable than staying alone in a small aquarium? Do you think he wont produced infections to other healthy fish? Or its better for me to wait till hes 100% recovered? What do you think should I do?