Could There Be A Missing Chipmunk?

My first theroy was this one, but it took five years to find real proof. To start off, a feature of personality called hidden personality could explain this. To cross between worlds, chipwrecked provides my example. Simon became Simone through a neurotoxin that appears to mainly effect inhibition. Where I am going is this, it may not have been a personality change, but rather a loss of inhibitions put there to protect himself. This would mean Simone is simply Simon's old one. When we look at the personalitys of Alvin and Theodore, we end up with two possible birth orders, one I already gave previously. The other is that they are triplets. Assuming the first, one chipmunk would be missing as it is always two to five born at once.