Chalam,
There is not the tension or competition about who saves in scripture that you are trying to create in the witness position, although the nwt confuses the process in their rendering of the passages in Acts.
John 5 shows the process of power being grantd from Father to Son, this is symbiosis not an either or position. Christ is front and center leading humanity to God, his Father from whom he recieves the authority to save, pardon sin and resurrect.
That was pretty basic Jewish messianic theology of the period- see DSS 11Q13.
designs