I think one advantage Kimbrel has that will give him more weight is the amount of strikeouts. He will certainly pass Smith this year and has an outside chance of having more strikeouts than any reliever in way fewer games than Wilhelm and Gossage and they are both HoF'ers.
I didn't need statcast to tell me Griffey Jr. hit the ball hard with good launch angles, or that Randy Johnson had great extension and a high whiff rate.