Griffey: .276/.384/.516, .900 OPS
Phillips: .272/.319/.462, .781 OPS
Dunn: .257/.364/.540, 904 OPS
One of these things is not like the others... one of these thing does not belong....
And if you're worried about Dunn batting cleanup against lefties:
Dunn vL: .238/.355/.474, .829 OPS
Phillips vL: .282/.327/.451, .778 OPS
Really, there's just no reason he should be batting cleanup and Dunn should be batting 5th, even to split up the lefties.
High average, low OBP, decent SLG, good speed. Perfect guy for the 5th or 6th spot. Dunn gets on base more, Dunn slugs more. Those more frequent hits of Phillips will help more when he's got an OBP machine ahead of him. And Dunn's homers will help more when he doesn't have a frequent out maker and double play machine ahead of him. Let Phillips drive in Dunn, not the other way around.