Listener : ...they believe the 144,000 anointed who have died began to be resurrected to heaven in 1914.
On the contrary, the Watchtower which you quoted claimed that " that the first resurrection began sometime between 1914 and 1935." It then went on to say
Could it, then, be reasoned that since Jesus was enthroned in the fall of 1914, the resurrection of his faithful anointed followers began three and a half years later, in the spring of 1918? That is an interesting possibility. Although this cannot be directly confirmed in the Bible, it is not out of harmony with other scriptures that indicate that the first resurrection got under way soon after Christ’s presence began.
So all that can be said with certainty is that the terminus post quem of the first resurrection is 1914 and the terminus ante quem is 1935. Possibly, "it could be reasoned", "it is not out of harmony with other scriptures", it began in the spring of 1918 BUT "that cannot be directly confirmed in the Bible".