G2098
εὐαγγέλιον
euaggelion
yoo-ang-ghel'-ee-on
From the same as G2097;
a good message, that is, the gospel: - gospel.
Mat_4:23 And Jesus went about all Galilee, teaching in their synagogues, and preaching the gospel of the kingdom, and healing all manner of sickness and all manner of disease among the people.
Mat_24:14 And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come.
Seems to me we are stretching things out of meaning. Gospel was simply a message of good news. And the message of good news was simply that the kingdom of God had come.
How we stretch this into a salvational plan is beyond me.