[fortheDeclaration]

There is only one body, and that is the church.

The Body is a specific designation for the Church, not for believers of any other period (hence a mystery)

Once the fullness of the Gentiles has been arrived at, then the Body of Christ, His bride, will be complete and be removed.

Saved Jews of the Old Testament (and Tribulation) are friends of the bride, not the bride.(Jn.3:29)

[Safrguns]

The Body is a specific designation for the Church, not for believers of any other period (hence a mystery)

First half of this sentence is correct... the second half has no basis in scripture. A believer is a believer. It is appointed to man once to die, then comes the judgement. Are you saying that Moses is not part of the Body of Christ? Joshua?, DAVID??? Who do you think the captives were that were set free by Jesus after He died on the cross?
You say there is only one body, which is correct, but then you refer to another body which is merely a "friend" of the bride?

Saved Jews of the Old Testament (and Tribulation) are friends of the bride, not the bride.(Jn.3:29)

Actually, you have mis-quoted John 3:29. Here, followers of John the baptist approach him with concerns that he is being upstaged by Jesus. John's response was that he (John) is a "friend of the BrideGROOM" John is referring to himself... not others. Friends of the Bridegroom is another reference to believers.