By not "officially" pioneering, they were not able to give you public praise and set you up as an example for others to follow. The amount of time you spent in service was not the main point. (For those of us who have pioneered in the past, we know how little difference that time makes in gaining converts anyway.) They want to be able to hold you up as an example to follow, subtly pressuring others to do it as well.
"The chain of command in cults is usually authoritarian, flowing from the leader through his lieutenants to their sub-leaders down to the rank and file. In such a well-regulated environment, all behaviors can be either rewarded or punished. It serves the leadership to keep their members off balance. If a person performs well, he will be given public praise from higher-ups and sometimes gifts or a promotion. If the person performs poorly, he may be publically singled out and criticized."
The above quote is from pages 60-61 of Steven Hassan's "Combatting Cult Mind Control."