Your IA seeking rejection of plaint will be taken up for filing of counter by the plaintiff in the next date of hearing.
The IA filed by the plaintiff seeking ad interim injunction shall no more be effective since the court has already framed the issues in the main suit. Therefore the injunction granted has not been extended.
In the main suit through the issues have been framed the trial in the main suit will begin once the suit is listed tor trial, since it has not been listed yet, you may wait for the trial to begin. The plaintiff only has to begin the trial.
As far as the second defendant issue is concerned, without seeing the contents of the plaint, no proper opinion can be rendered about inclusion or deletion of second defendant by the plaintiff. Once a defendant has been impleaded in the plaint, the plaintiff cannot automatically delete the second or any defendant on his own, he may have to file a petition with affidavit to amend the plaint by which the desired changes can be made. this is court case and not a private play station where anything can be done at any moment without caring for any norms or rules.
If the opponent is desiring to withdraw the suit, he may be filing a petition to that effect, you will be required to file your counter, in that you strongly object to his withdrawal and may request the court to dismiss the suit on the reasons you strongly rely upon and also may insist before the court to not to grant leave permitting the plaintiff to file a fresh suit on the same cause of action.