How come you will join Employer-B without H1B transfer? Are you joined employer-B already ? If you joined Employer-B then how come you joined employer-B with out H1B Transfer.
If i94 is already expired then employer-A is applied extension.. Is this extension is approved? Are extension is pending ?
If i94 is expired already and extension is submitted and not approved how come employer-B is taking up your case?
Are you serious about your case and explianed facts here properly?