Donkey hoof abscess problem and wall separation 1

He was trimmed 2 months ago. The other hooves are fine. Wall is separated, almost looking like founder. He was walking back on his heel bulb and toe was getting longer. The heel got injured so he had a problem with toe and heel. He was on pasture with the rest of the critters and he never noticed any lameness at all.
He may have had an old abscess that healed and the sole grew over it but it was still there?
Founder/ abscess, whiteline without pain?