Just to throw out a couple potential other scenarios -
1. The winner will be someone African American bc of the current political climate (I know, not very PC but seems everything is politicized these days *sigh*, so...) in which case I would expect to be John Holliday b/c Tamara and Desz being both big voice divas might kinda cancel each other out.
2. Ian somehow pulls a Jake Hoot, not outside the realm of possibility given the Blake/country fanbase. How many previous winners were 1-chair turns?