Looking at the replies in this thread, I realise we have to take a step backwards on this one. We have to define the gospel. All over this thread, we have people talking about target audience, outreach strategy, and corollaries of the gospel (e.g., social concerns). We even have a contributor who doesn't think we can ever know the gospel that Paul preached!
Let's not put the cart before the horse. Let's first define the gospel preached by the apostle before we determine whether Lee measured up to it.
May I request that we all read the following articles before continuing this discussion:
Definition of the gospel:
https://bible.org/article/what-gospel
God's plan of salvation:
https://bible.org/article/gods-plan-salvation
The Roman Road (presentation of the gospel):
http://www.gotquestions.org/Romans-road-salvation.html
Let's see if we can all agree these are the tenets of the gospel before moving on to whether LC preached a different one.