You think too much.
During your J1 was approcing, you still can extend your J1 visa. It is better to send to INS (not 領事館) after you get new J1 form. 領事館 only provide a "non-objection" letter for you.
During your J1 was approcing, you still can extend your J1 visa. It is better to send to INS (not 領事館) after you get new J1 form. 領事館 only provide a "non-objection" letter for you.