I don't understand why people would even try to imagine more redundancy and think he should have a delivery where he's devoted to having some kind of "signature complexion" for a large amount of tracks at a time rather than just adjusting his tone of voice for each beat like he should be doing (or
was doing, when he found this delivery). A "whisper" would get annoying faster than any other type of gimmicky voice would, considering the very limited number of ways you can sound different while doing it unless you whisper to the point where the beat overpowers you. Unless, he starts whispering
in accents 
. Also:
Accent > Whisper > Screaming
This, depends on which accent though.