Here is an anecdote about Arthur Eddington: So Eddington thought only he and Einstein understood GR, at some point in history. My question is: did Eddington not realize that David Hilbert was able to derive the Einstein Field Equations before Einstein was? Why did Eddington not feel that Hilbert understood GR? And what did he think about the other early experts: Schwarzchild, Lemaitre, de Sitter, Friedmann, Robertson, Walker, etc.? Were they not smart enough for Sir Adding-One? Or was there some intricate chronology of who understood what when?