Part 1: (Introduces Stone Masks) Dio obtains the stone mask and becomes a vampire

Part 2: (Introduces Red Stone of Aja) Kars obtains the Red Stone of Aja

Part 3: (Introduces Stands) Dio obtains a stand

Part 4: (Introduces Stand Arrows...kind of) Kira uses the stand arrow to power up

Part 5: (Introduces Requiem Stands) Girno obtains GER

Part 6: (Introduces obtaining heaven) Pucci obtains heaven

Part 7: (Introduces corpse parts) Valentine obtains the corpse parts

Part 8: (Introduces equivelent exchange) ??? merges with ???

Just speculation of course. I can't really understand how this would happen or who it would happen to but it could lead to an interesting finale.