There's only one thing that I want to raise with you in this letter, and it's Einstein's second postulate. Of course all these questions, if we enjoy them so much, for the sake of logic argument, can always be answered. And that's exactly what has happened with Einstein's time dilation for 90 years since we accepted his second postulate. They're still coming. Your students would still keep asking the same questions your teachers have asked before.
Many people are still confused.
Some understand but cannot explain to idiots. Some don't understand but have stopped asking to stop being called idiots, too . If there's one scientist can do it, you are the one. If you go back to history, you'll see Einstein has never proved his second postulate. A century ago when scientists were stuck with Michelson-Morley experiment's negative result, Einstein took the bold step and made his claim about the absoluteness of the speed of light.