There were, in fact, two participants in the foundational conference who opted at the last minute not to join the Front. That’s about it really. Now, I leave it up to you to decide whether the two figures opted out because they were not selected as members of the 11-member General Secretariat, or whether they had some lofty moral principle that was somehow violated in the process. Albeit, I have to admit that the other guy who opted out, Abdulhamid Haj Khodr, is actually a very decent fellow armed with an explosive temperament.
The two participants had complained about the way members were elected to the Front's Central Committee, describing the process as "undemocratic." Abdulhamid commented further on this issue:
Now as for the whole idea of elections that many have already griped about, frankly, they were not even on the table at this stage: we are still in the preparatory phase, we are still developing our programs, our vision and our message that we want to take to the Syrian people and the international community, and the very ideological diversity within the Front means that we cannot agree on these issues within a day or two.
Abdulhamid is a member of the NSF's Central Committee (Arabic).