The followers of Srila Bhaktisiddhanta Saraswati Thakur consider him to be a nitya siddha bhakta. IOW that he and Srila Bhaktivinoda Thakur came down from Goloka to serve Sri Chaitanya Mahaprabhu by expanding His divine mission (sankirtan). The followers of Srila A.C. Bhaktivedanta Swami believe the same about him. If we think that we are nitya siddha, also, then we have no way in which to distinguish ourselves from them. It that sense, 'it all becomes one' which is similiar to the siddhantic mistakes made by the followers of Sankaracarya. Again why is the term 'nitya baddha' appear so many times in the Caitanya Caritamrta? The answer must be that it was used by Sri Caitanya Mahaprabhu, Himself. From the eternal viewpoint, everyone is nitya siddha, but we will not apply that viewpoint when thinking about our gurus who include the eternal associates of Krsna (parivars) because our logical conclusion would be anti-devotional.
PS: And I also agree with Sonic Yogi in the last post #223.