2) In the second case, your trademark is "questioned". Even if the certificate is obtained, if the other party submits the application within the objection period, the objection application will arrive at the Trademark Office after the certificate is issued due to time problems such as mailing. Then enter the objection according to legal procedures.
In other words, you have no substantive rights to this trademark. Wait for the objection result to be published.
3) It is suggested to entrust a professional organization to reply and reply according to the actual situation, as long as the evidence is sufficient. The defense is usually successful.