That would make sense, healthy adults can usually avoid the intakes no problem. Covering it up is a good idea if it's happened once already.
I would just make this his new feeding schedule, honestly. He sounds like he's prone to bloating, which can be made worse by a single large feeding per day. Feeding twice isn't really any more work, and it'll help him get stronger.
If underfeeding/malnutrition was the cause of his spine problem, he should start to fatten up and straighten out in a week or two. He might always keep that bend though, but if he gets stronger then it shouldn't affect him too much.