Before seeing the Service Regulations of your organisation its very difficult to  comment on the merit of the promotion Policy. 

Apparently the out of turn promotion of the employee is without any known principle of law.

Though no employee has any vested right to be promoted, he has been entitled to be considered for promotion. 

In NR Parmar the supreme court rejected the claim of the promotees, that the direct recruit IT inspectors should be assigned seniority with reference to the date of their actual appointment in the IT department.

N R Parmar case is applicable to you. The judgment has interpreted the OM of 1986.

There may be people who got selected in 2011 but the notification may be much earlier.

If that judgement ratio is applicable to you then it's correct overview.

You can challenge the promotion. 

Please stat and mention your class and category and candidates who have been promoted ignoring your eligibility for the compliance of process of promotion and transfer under State and Central Government employees Rules.

We need to understand the brief facts of your case and case of your opponents. 

Class,category and status. SC/ST/OBC/GEN etc. in the department. 

File a Wrt in HC

You are advised to file a writ before the Hon'ble High Court as neither they are in true sense applying Rajeev Case nor N R so clarification sought , what impact at the parent base and transfer base has impact on promotion when the department is same and under the same authority i.e. Central Government.

Have you given a representation regarding this issue. If not please do the same immediately. Then wait for one month for the reply. If there is no reply from them then you can directly approach the court by filing writ petition. 

Dear Sir,

You are suggested to submit an RTI application to your HR department of the confirm as to how and why that happen. Also, ask the latest and existing and policies since the time, you joined the service. it is clear that you have been wronged and after getting reply from the department, submit the grievances in the form of humble but firm application to the department and if you don't get the reply within 6 months or you get the unsatisfactory reply, then file the case in CAT or High Court.   

First of all you stop getting compared to the court decisions in this regard even before you have started taking any action as per law. 

You first draft a neatly drawn representation in writing enumerating all the background history of your case,  your grievances,  conclude your representation with a request to the competent authority to intervene, address your grievances on legal and humanitarian grounds and to provide you the desired relief especially to overcome your grievances,  anomalies and other injustices meted out to you. 

After the competent authority rejecting your request/representation,  you may approach CAT where you can refer all those decided cases to support your cause as a first step of legal action. 

In a fight for seniority between date of joining versus date of appointment, date of appointment has to be thrusted upon.,

Individuals appointed and joined after you, wrongly placed above you. 

- As per Delhi High Court , there is no law that a person has to be promoted because juniors below him have been actively encouraged. 
- Further , every person eligible for promotion as per the relevant Promotion Rules of the said department /organisation

- Further , the NR Parmar case is applicable in your case , however you should approach CAT for getting justice. 

1. As per the information mentioned in the present query, makes it clear that though there has been judgment in ruling, but still doesn’t give the clear ambit to the department for not considering your case as the same is little different from the Rajeev Logan judgment.
2. I would like to apprise you that the facts of that case and your are not totally in similarity and not even question of law if same time same extent.
3. As you need to understand that the Seniority is decided based on the case to case basis along with the harmony of any judgment been assed against it.