The Trinity is just a CONVENTIONAL doctrine: no "helper-Godperson" exists. It was not understood that the Holy Spirit is none other than the "Father who is a spirit" ("God is a spirit" Jn. 4:23,24). You can figure out from the verse on the two blasphemies, where "that Spirit, who is the Father" is called "Holy Spirit" by Jesus. Only that Spirit who is the Father and is called "Holy Spirit" is with Jesus.