I had a hatchling a few years ago (my first pied ever, so I was doubly anxious) who crawled out without absorbing his yolk. I put him in a deli cup with a moist paper lining and he absorbed 80% of it in the next 48 hours, a small nub never absorbed and eventually fell off a half a day later, similar to yours just much smaller.
He ended up recovering just fine. Without a reference its hard to tell just how much was absorbed, you can tell better than us. if he absorbed some, I might try waiting until after he sheds and offer him food then; if he didn't absorb much at all, then I agree, wait a couple of days and then offer food or assist feed him to get some nutrients into him.
I'm sure he'll be just fine - good luck!
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