If God the Father has a Father, and if the concept of “Godhead” isn’t infinitely expandable to include all Gods, then our Father belongs to two Godheads, one of which Jesus is not a part of. If God the Father does have a Father, and if the Godhead is infinitely inclusive of all exalted Gods, then the Godhead that is “one” is potentially comprised of an infinite number of Gods.
Also, if Jesus becomes a Heavenly Father with his own “Firstborn Son”, and if the concept of “Godhead” isn’t infinitely inclusive of all Gods, then Jesus will belong to a Godhead that our Father doesn’t belong to.
If the concept of “Godhead” isn’t infinitely inclusive of all Gods, just how many Godheads can a God in the Mormon universe belong to?
Can you imagine Jesus saying to the Father, “I’ll be hanging out with my other Godheads this weekend”?