User blog comment:The Six-Fingered One/The Psycho Series -- and My Thoughts On It/@comment-5100783-20160531180037/@comment-26428853-20160531222657

That is a good observation, and I agree. Also if you go back and watch the really early vlogs, Jesse's voice sounds different in its emotion and energy. He has certainly changed in personality over the course of the series, and the hair could very well mirror this.