Good point Earnest. But your viewpoint may be extended to anything in the NT... From a very dispassionate viewpoint,
P45, P66, P75 are some of the oldest copies of the NT. Even older copies do not contain the word Stauros, so we cannot know if these pictograms appeared in those copies.
The copyists were clearly Christian, since the use of Nomina Sacra seems to be an exclusively Christian tradition.
The original NT could have been a totally made up story, could have been an account by eyewitnesses. Either way, we do not have the originals. We only have the copies. The entire NT is, in your words, " evidence of what people understood some (thirty to fifty) years later."
The Staurogram appearing in the manuscripts themselves is significant because, even if it was the Ankh, even if was adopted by Christians by the year 200, it at the very least proves that the copyists of the manuscripts thought that Jesus died on a cross. If the copyists were "apostate" as the WTS calls anything and anyone it doesn't agree with, then when we are reading the NT we are, according to them, effectively reading "apostate literature"... and God allowed apostates to copy the NT for us... apostates who removed the name "Jehovah" from the NT and inserted pagan symbols into the very Scriptures!
The WTS theories are so laughable....
ILTTATT