meaning - Positioning "only" in "I have worked with X"

1) is clumsy. Put a name there. I have worked with only Erica.: Don't use that.

2) I have worked only with Mr. X: and nobody else. I didn't work with Kate!

3) I have only worked with Mr. X: and nothing else. I didn't sleep with him!

4) is clumsy, again. Example: I have worked with him only. Don't use that.

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