Loose hair will find their way, they will find a family to join onto. Forming dreads can have 3-4 inches of undreaded roots. Mature dreads have about a 1" loose root. They naturally stay loose, this reduces stress on the scalp, dreads need to move and do move, if the scalp root system is tight, then it would pull on the hairs, pulling them out by the root system.
Where you lay loose root wise because of the backcombing I am not sure, but you do want them loose.
I hope that you loose no more! Peace
updated by @the-barrellady: 07/10/15 04:19:10AM