A lot of people seem to have gone missing over ten years.
But yes, you MUST be an active pubnlisher each month for at least 6 months before you can be baptized.
The report in the yearbook gives:
The TOTAL number of publishers who reported FS that SY whether baptized or not.
Then, the break down, of the TOTAL number the number who:
got baptized that SY
were serving as reg pioneers (average month)
were serving as aux pioneers (average month)
All of these are already INCLUDED in the total pub figure (average & Peak pubs)
Thats why you can't ADD the number baptized to the publisher figure. The number reported as publishers is already including all who got baptized that SY and who were pioneering that SY.
The breakdown just shows OF the pub figure how many just got baptized during that SY. They were ALREADY counted as publishers before their baptism!