They meet at the cross where Jesus became sin so that we might be the righteousness of God (2 Corinthians 5:21). God’s grace is the only way to change from the fatal nose dive to an eternity in heaven. The diagram is meant to be a logical progression rather than a strictly chronological one since elements of God’s salvation happened in eternity past and in past, present, or future space-time. A friend pointed out to me that the first three items on the upper curve are attributed to the Father, the next 5 items to the Son, and the last 4 items to the Spirit. Of course all three persons of the Godhead were involved in all parts but there is the lead person.
CreatorWorship 
I’m a visual learner so I appreciate this graph. Very neat concept!
Yes, I am a spacio-visual learner, so that placing things in order and alignment helps me to remember them. Thanks for the encouragement.