Article 324 deals with Election Commission. It states, among other things, â€œThe Election Commission shall consist of the Chief Election Commissioner and such number of other Election Commissioners, if any, as the President may from time to time fixâ€¦â€ CEC is enough. ECs are optional. For a long time India had only CEC. In 1989 Rajiv Gandhi government appointed two ECs. Rajiv Gandhi was unhappy with R. V. S. Peri Sastry. When V. P. Singh government came to power they removed the two ECs. When T. N. Seshan became CEC he took decisions that favoured Congress. Janata Dal wanted his removal. P. V. Narasimha Rao promised that but did not keep his promise. Later T. N. Seshan became a problem for Congress. Then Congress government appointed two ECs. As the governments changed they continued with Election Commission as a three-member body. They promoted ECs as CECs and brought as ECs people who thought were suitable for them. Sometimes the calculations went wrong.
CAG is a constitutional authority. He is not a servant of the government of the day. If he finds any subordinate not doing his job properly he has the right to overrule him. In judiciary there are various courts but the decision of the Supreme Court is final. It can overrule High Court or other courts. High Court can overrule Sessions Court. In Supreme Court judges on the same bench disagree and judgments are by majority. There is nothing strange about CAG overruling DG.