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Truer words were never spoken! And few of us (even commentators) have nearly the OT awareness and understanding that the men who received those letters had, and, thus, were immediately able to easily associate and relate John's words right back to all the history each of those Jews knew by heart. He wrote about things that would mean something to them... but, they would not instinctively mean anything to us. We have to do something I am convinced they never had to do.... We have to speculate and guess... and then go on assumptions.
Daniel had to speculate and guess, All OT people had to speculate and guess. In fact, they were caught off Guard because they were not looking, when they should have KNOWN when messiah would come, daniel told them when and Isaiah told them how (on a donkey) There should have been no way Israel would reject him a week later if they were looking and understood.
It was after those things that paul and others were able to use OT prophets to show christ, I also believe it will be when the things of revelation occur that people will start to see things, Especially Israel. since to me, it is the time of Jacobs trouble which will be occurring. which is spoken of by jesus where he called it tribulation, and john gives us a greater detail off the events which will happen.