I am not sure he has anything to file. If he files an objection to the plan that just restates all the arguments he has already made, he risks pissing off the judge. He has to come forward with new evidence, not just rehash the argument he used to get an examiner and object to the disclosure statement. If he has nothing new, then he just waits till the hearing and fights it out there.
Why would he file? It's already implied that commons will object, and prefs are in the process of voting. I'm sure he will argue at the hearing, but the PPS on all classes may take a small hit. AIMO