the Bacchae is simply the old Sacer Ludus itself, scarcely changed at all, except for the doubling of the hero into himself and his enemy. We have the whole sequence: Agon, Pathos and Messenger, Threnos, Anagnorisis and Peripeteia, and Epiphany.
Harrison argues that the Bacchae is not merely influenced by ritual but is ritual drama directly, its tragic structure identical to the Eniautos-daimon sacrifice-and-resurrection sequence.
, Themis: A Study of the Social Origins of Greek Religion, 1912thesis