I (like everyone) love Denzel, but I hope he isn't Dormammu.
Specifically because it ruins my, possibly outlandish, fan theory. Cumberbatch did the motion capture for Dormammu in the first film. I always thought it would be fun if Dormammu turned out to be a Doctor Strange variant. In What If we meet a much darker Doctor Strange variant. In Multiverse of Madness we meet a number of variants, all of whom also make dark choices. For me the logical conclusion is that eventually Strange has to battle the darkest variant, Dormammu.
Obviously however I welcome Denzmammu if that's the case.