That is right. Baha'u'llah claims to be the Father (that is, he claims to be God) while denying that the Son is God.
I would say that the teaching about the Trinity is what Jesus meant when He said they could not bear it at that particular time.
It is interesting that Baha'u'llah claimed to be the Father but not be the Father at the same time.
Can you explain that?
Baha'u'llah said a lot of things.
So how can Baha'u'llah be the Father (God) but not God at the same time?
Another question: How can Baha'u'llah be the Glory of God when God said that He would not give His glory to anybody else?
Baha'u'llah has explained this in great detail and it is applicable to all the Messengers including Jesus, who was also an 'Annointed One' Christ is not a surname, it is the given station of the Messenger. They one and all are born of the flesh, but in reality, they are already annointed of the Holy Spirit.
They appear to us in that two fold station. On one hand we see a man like others, on the other they are the Annointed 'Self of God' amongst us, they are all we can know and see of God. All other thoughts as to what God is, is but our own vain imaginings.
So the Son is a station, the Father is a station bestowed by God, it is but the same Holy Spirit.
That is why Jesus offered the flesh amounts to nothing and that it is the Spirit that is life, that is why when Jesus asked the Disciples as to who he was, he confirmed Peter's answer that he was 'Christ', thus confirming he was Annointed by God in the Station of the Holy Spirit, the 'Self of God' amongst us.
They are the Word of God, the Attributes made flesh, not God in Essence who forever remains exalted over all creation, access to the knowledge of God is barred.
Now we can consider that Jesus when he is talking about the the Father is greater than I, Jesus is really talking about his own Essence and his promise to return as the Father, not as the Son, but as the Father, the same Holy Spirit. Remember Jesus said he had to go away so the Father could come, that the Father would have a new Name, a name we would only accept, if we accepted the Father. Jesus would bring a new Jerusalem, a new Law sent out from Zion all as the Father, the Kingdom of God on earth as it is in heaven.
There is so much to consider, so much to unravel, when God has given us all Truth.
Regards Tony