I think the following will be more productive than trying to answer your specific questions here. You will also gain some understanding of the resources we have available here. There has been a lot of discussion of this kind of question in the past, including Tom. Linda might have some handy specific references but I do not and would have to do searches. The general principle is that the state of information in the VR is maintained consistently. But also, if something is unknown, or if information held by someone in the past is totally lost as by their death or the simple loss of the information record including anyone's extant memory, then things return to probability. When such information is required again by observation, the simplest thing is done and the most probable result is returned. Information which is not known by anyone is taken from probability. Superposition as you say. Information that is known is maintained consistently.
I suggest that you consider reading through these links in this forum [Board index » An Archive of The Best Threads From All Forum Topics]: viewforum.php?f=18
These are links to threads, typically including important information from Tom in various categories. They were not set up by Tom but rather by board members who thought specific threads were of particular value.
Then there were 'lectures' which were made up by Tom and I as Tom picked particular subjects as threads from the forum and created the original compilations and then I took them and generalized them into more smoothly flowing lectures based on what Tom was saying, moving them away from individuals asking questions and Tom answering them as their original form. Tom then used them for handouts as introductions for many of his early presentations. Then they were placed on the Wiki for ready access by anyone. They read more smoothly like lectures now rather than in their original question and answer in posts format. There have also been further additions by Tom on specific subjects. http://www.wiki.my-big-toe.com/Tom_Campbell_-_Lectures
You will find them all of value and can probably pick the ones most likely to answer your questions from the titles. I think that none will waste your time in learning something of value that Tom has taught here. You can also download any or all of them as PDF files using the Wiki standard capabilities to save them on your own computer to read at your leisure.
Finally you might do a search on the board for the terms 'trees woods', short for trees in the woods, since 'in' and 'the' are too common for search terms and would be ignored. Search for twcjr as the author which is Tom. This will bring up 17 links in the extensive discussions based on the old question, if a tree falls in the woods and no one is around, does it make a sound. These should cover much of the territory which you are asking about.