Kinshifts are not the same thing as fronting/being multiple. Kintypes are not the same thing as fictives/headmates.
During a shift you experience a continuity of self, despite taking on traits of your kintype. It is the same as having an intense emotional episode, such as being depressed, having a craving for something, or experiencing an altered state due to meditation. It does not turn you into a separate person.
If your “kinshifts” make you feel like a completely or significantly different person, with a different ‘self’, then you should look into soulbonding, multiplicity, fictives, etc, because that may not be a kinshift.
Likewise, having multiple kintypes and shifting between them does not make you multiple/does not mean you have fictives.