What I understand about the gospel is; it's the word that leads the people unto salvation. The gospel is the good news that Jesus commissioned His apostles to teach. If faith is based on hearing and believing in the gospel, should it different from what Jesus and His follows taught plainly?
The "everlasting gospel" is the same words preached by which we're saved.
Here is another writer's account taken from a bible dictionary about the Gospel.
<http://www.blueletterbible.org/Search/Dictionary/viewTopic.cfm?
type=GetTopic&Topic=Gospel&DictList=4#ISBE>
Ok. So what's the issue then? You understanding of the gospel, from what you've said here, doesn't seem to be any different from our understanding, or at least, from mine. The gospel is the good news, and it is what Jesus taught. What I gave you from Revelation is just that. John said the angel had the everlasting gospel, thus I don't see how what he heard would have been different from what Christ taught in regards to the gospel message.
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