Leave himself

[Xinfu]

-He could threaten to leave himself.

Is 'himself' just an intensifier without much meaning? Are the red words the same as 'leave' simply?

[Rusty]

Yes, the whole reason for the word 'himself' is emphasis. Another way to phrase the statement is:
He himself could threaten to leave.

You can, of course, rephrase the statement with no added emphasis and, in that case, the answer to your second question is yes.

[Xinfu]

Thank you.