I provided the other side a great hint which they failed to recognize. Here it is spelled out in great detail for them: A trained historian would be trying to access original documents like O Sensei's travel diary and his callendars. As well as those of the people around him. As well as any related receipts Etc. Only with these will you be able to establish how much he traveled during different periods and with whom.
Yes, definitely. So, have you done that?
You really should look at your own methodology before you lecture other people about theirs.