I Need Advice!!
Help! Save My Dreads
Since you lost the hooks, just leave them lost. Your hair and scalp will thank you for it.
That loose hair at the roots is what your locks actually grab hold of and use to thicken up the root and tangle with to create the lock itself. If you were to crochet that loose hair into the lock, you would be compressing it so much that your locks would end up thinner than they should, like Val said. In time the new untouched locks will be thicker than the crocheted portion. If you wanted, and I would recommend it, you could use some jojoba oil, or aloe vera and work it into your locks to help them loosen up a bit. This will allow them to "breathe" more and naturally tangle in on themselves. Then you wont have any portions that look unnaturally skinny coming out of a thicker lock.
But I think that Val pretty much get the major points. I'd also recommend you check out the recovery pages. Crochet recovery takes time. From 1 session, it can take as long as 6 months. But it is worth it. They won't come completely out, where you'd have to start over, but they should loosen up quite a bit and become softer and more spongy rather than rock hard