1. The RTI PIO is bound under the parameters of section 5 & 6 of the RTI Act, to render "ALL" assistance to the RTI Applicant, in all possible manner, which includes informing the applicant of any deficiency /mistake in the RTI Applicaton.
These are hypothetical questions. Are you preparing for an examination or are you having a problem and, in case of the latter, what is the problem? If you send an RTI application without signature and the PIO does not reply because the application does not bear signature, you will not come to know of it. If you do not reply you will appeal to the appellate officer again with or without signature. Let me assume that you signed at least the appeal. On action taken by appellate officer, either he will inform you that you did not sign the original application or he will get you the information sought. Thus in a practical situation there will be an yes or no in every step and sub-step and one will have to make a big chart to answer you. So be practical and state exactly your problem or if you are preparing for an RTI law examination, state that.
It may be a real problem for you. But when you start sentences with 'If', it becomes a hypothetical problem for us here. Give sentences using verbs in past tense and ask us. Don't say "if it so happens, what to do?" Instead say it happened so. What should I do?.