with/participle phrase

[Navi]

Are these sentences correct:
1-John left the group, with Sally replacing him.
2-John left the group, Sally replacing him.
Meaning: John left the group and Sally replaced him.

3-With Sally joining the group, John left.
Meaning: John left the group because Sally joined it.

[Mister Micawber]

1 and 2: yes.
3: that's what I would guess but not necessarily.
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Native English teacher at Mister Micawber's

[Navi]

Thanks Mr. Micawber,

One more question. Would this one work as well?

4-Sally joining the group, John left.

[Mister Micawber]

Yes, the grammar is OK, though it reads a little odd outside of prefatory context.
_________________
Native English teacher at Mister Micawber's