Kallmann syndrome is not the same as delayed puberty (or I am not a late bloomer).
A common theme with rare disorders is the delay of diagnosis.
I was seen as being a "late bloomer" when I had not started puberty by the age of 16. Even though I had two of the extra symptoms, lack of sense of smell and poor hearing, I had to wait until I was 23 before I got the correct diagnosis and was put on testosterone treatment.
Late diagnosis and treatment can make such a different to fellow patients.
Even with treatment patients do not experience normal puberty and would require extra treatment if fertility is desired.
One issue patients can experience is that we are mixed up with "late puberty" patients. Some people assume that after treatment all is normal.
Delayed puberty patients can experience normal puberty after a short course of treatment and will experience normal puberty and be fertile. Patients with Kallmann syndrome (male and female) do not experience normal puberty, will need life long hormone treatment and require specialist hormone treatment if they wish to be fertile.