Joh 1:1 clarifies the relationship between the Word and God who is Spirit. The Word and Spirit are One. It is not a matter of there existing two beings. Rather it is the recognition of -> the conscious mind that interacts with things external to the person and -> the spiritual essence of the person.

God is Soul and Spirit defining One person.

In the human sense a Father and Son are distinct persons. And we know that it is unlikely that any Father and Son pair have ever agreed on everything. This is because they are not one but separate and distinct souls and spirits.

So, when we hear the term Father and Son, we naturally think distinct persons. However, Jesus said ^I and My Father are One^ Joh 10:30.

Similarly, when we hear the word, heir, we think in terms of one person (the father) who dies and leaves his estate to another person (the son).

The HolySpirit has not died yet He has willed all power in heaven and earth to Jesus who is His physical image Heb 1:3.

Lastly, the HolySpirit is the Creator but so is the Word (the Son) who spoke everything into existence according to His own purpose. Yes, before Jesus was born into humanity, He existed eternally as the Word - the SoulOfGod - the expression of the WillOfGod defined by the SpiritOfGod.