We have been given the ministry of reconciliation, but we cannot mediate on anyone's behalf as we are not qualified like Jesus is.
Besides, you can argue all you want about who's a mediator and who is not, but your issue is with the Holy Spirit as He inspired Paul to write.....
1 Timothy 2:5-7 For there is one God, and there is one mediator between God and men, the man Christ Jesus, who gave himself as a ransom for all, which is the testimony given at the proper time. For this I was appointed a preacher and an apostle ( I am telling the truth, I am not lying), a teacher of the Gentiles in faith and truth.
Both of you can't be right. It's either you or the Holy Spirit.
Guess who I'm going with.....
Asking others to pray for you (even those who are (as far as we know) already in Heaven) is not trusting in them for Salvation.
Sounds like Revelation 5, especially verses 5 and 9...