First he suggests it's confusing that in Revelation 8 these Seven Angels show up apparently with no prior introduction if you don't identify them with the Seven Spirits. I never felt that way at all, new things are showing up constantly in Revelation. The Angels I have always pictured standing on or by the Altar of Incense, which was not in the scope of chapters 4 and 5. They are clearly not between the 24 Elders and the Four Beasts as the seven Lamps are.
Also Angels are NOT Spirits, not the good ones anyway, they all have physical tangible forms, we can entertain them unawares. Demonic Spirits are distinctly different kinds of beings.
He attacks the connection of this verse to Isaiah 11:2, repeating a common mistake an English first glance reading will give you, that only Six Spirits are described there.
And the spirit of the LORD shall rest upon him, the spirit of wisdom and understanding, the spirit of counsel and might, the spirit of knowledge and of the fear of the LORDThe Six are additional Spirits that come from but are sort of distinct from the First Spirit mentioned.
The intimate relationship between The Lamb and the Seven Spirits in Chapter 5 makes clear they are The Lamb's Spirit just as he described The Holy Spirit as His Spirit. The means by which He communicates with and guides believers still on Earth.
The problem I have with this bad interpretation is that when you read Revelation 1 without being distorted by the man made verse divisions, verses 4 and 5 have a clear expression of The Trinity.
from him which is, and which was, and which is to come
from the seven Spirits which are before his throne
And from Jesus Christ, who is the faithful witness, and the first begotten of the dead, and the prince of the kings of the earth.It's absurd to think beings that aren't God would be sandwiched in between titles which clearly apply only to God.
Update April 2016: Maybe you could make an argument the Spirits are the same because the Angels mentioned are the Holy Spirit, because again Angel must means messenger and we need to quite thinking of it as a technical term.
The Angels of the Seven Churches are I believer Believers in those congregations with the Gift of Prophecy, White is right that the Early Churches weren't monarchical, but that doesn't rule out that Angel can mean a human messenger, as it was used of John The Baptist.
I have a new theory about the Seven Trumpets, Shofars, explained in my The Ram study.
There is still no doubt in my mind the Seven Spirits are The Holy Spirit.