The WT recently admitted that the 'channel' was not always in existence.
see WT Study Edition - July 2013
14 The apostasy made some inroads in the first century, but Jesus’ faithful apostles acted “as a restraint,” holding back the contamination and influence of false teachings. (2 Thess. 2:3, 6, 7) However, once the last of the apostles died, the apostasy took root and flourished during a long growing season that lasted for many centuries. Additionally, during that time, the weeds became many and the blades of wheat were few. There was no consistent, organized channel for dispensing spiritual food. That would eventually change. But the question is, When?
HARVESTTIME—WHO WOULD DO THE FEEDING?
15, 16. The Bible Students’ diligent study of the Scriptures yielded what results, and what question arises?
15 As the end of the growing season neared, there were strong stirrings of interest in Bible truth. Recall that in the 1870’s, a small group of sincere truth-seekers got together and formed Bible classes apart from the weeds—imitation Christians within the churches and sects of Christendom. With humble hearts and open minds, those sincere Bible Students, as they called themselves, made a careful and prayerful search of the Scriptures.—Matt. 11:25.
16 The Bible Students’ diligent study of the Scriptures yielded rich results. Those loyal men and women exposed false doctrines and spread spiritual truths, publishing and distributing Bible literature far and wide. Their work won the hearts and convinced the minds of many who were hungering and thirsting for spiritual truth. An intriguing question therefore arises: Were the Bible Students in the years that led up to 1914 the appointed channel through which Christ would feed his sheep? No. They were still in the growing season, and the arrangement for a channel to provide spiritual food was still taking shape. The time had not yet come for the weedlike imitation Christians to be separated from the true Christian wheat.