Agree on the morse code being sent at "speed of light", compared to the choper or boat coming through the 'dome". I also see the dome as not being perfectly smooth, but to have a "wrinkle" of sorts or not uniformed.
Do we know exactly when the last time was when we saw the doc? This is a question to his body washing up on shore. If the beleif now is that you can leap forward or backward in time will someone be going back in time to save some of our 815ers. Maybe saving Charlie? I do see where the doc could be alive and dead at the same time, similar to seeing wabbit 15 twice.
Another thought, didn't they try to get the two wabbit 15s away from one another thinking something bad would happen?
Did doc1 meet doc2 and have a throat cutting party?