An animal that has bands on both body and tail is a Banded (a). An animal that has an irregular pattern on both body and tail is a Jungle (b). An animal that has an irregular pattern on its body, but a banded tail is generally referred to as an Aberrant, with some arguing for Jungle ©. An animal with a banded body, but an irregular tail is generally an Aberrant, with some arguing for Banded (d). I personally feel that an aberrant animal has an irregular pattern on body or tail but not both (so both c & d).
Also, I don’t use the term ‘linebred,’ because that implies that inbreeding is required, when that’s not true. You can take two unrelated animals and easily produce Bandeds, Jungles, and Aberrants, just as @westridge described. ‘Selectively bred’ is more accurate. This past season I bred two unrelated banded geckos, and they produced Banded, Jungle, and (if I’m recalling correctly) Aberrant offspring as well. Do I need to take pictures of all of them?
I definitely agree that it’s complicated to the point of being subjective. I’ve seen a ton of animals that are mostly banded, except for one band having a definite, irregular wiggle, and people often will ignore that and still call those animals Banded. In leopard geckos, ‘Stripe’ and ‘Patternless Stripe’ are both selectively bred, insofar as I know (not counting Ciphers or Super Snow patterning). Then there’s the hyper /hypo melanism aspect, which is also selectively bred. I feel like I might be missing out on a step of the logic, but all of that suggests, to me, that pattern is definitely way more involved than a simple Mendelian recessive trait.