We're all different, both when well and ill. Likewise, our illnesses or injuries are different, and will respond to various treatments differently.

This is especially true with sciatica and it's effects, because we're describing a symptom, and not the cause. There are plenty of causes underlying sciatica, from disc injury, spinal stenosis, to simple a short term nerve flareup. Some people may have sciatica because a muscle spasm, ie. in piriformis, that affects spinal alignment, in others the sciatica causes the piriformis spasm.

The takeaway is to keep an open mind, find what works for you, be it stretching exercises, changing riding position, drugs or other medical intervention, etc. then stick with it until there's a reason to change.