Why don't all the teeth come out at once?

Atticus has been fussy for the past week for two reasons:

1. We think he is teething. He currently has 6 teeth (4 on top & 2 on the bottom), but we think his molars are coming out. He whines when we feed him sometimes. He prefers chewing on a teething biscuit. He also cries when we feed him milk once in a while. For a few nights he woke up at 10pm, 2am, & 4am and drank 3 bottles of milk, depleting my refrigerated reserve.

2. He has developed separation anxiety. Even in our tiny 2-bedroom apartment, he will cry when we set him down & walk across the hall to use the restroom.
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My maternal grandmother cannot pronounce his name & calls him "Atticut," which ends up sounding like "Etiquette." I drove her to dinner tonight from my grandfather's grave site, and all I heard from the backseat was "Etiquette, Etiquette." I had to chuckle.

My dad calls him "Attica" sometimes, which makes me think of the prison in New York State, I think.
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He will raise his arms, clap hands, give high fives, & kiss by leaning in all on command. It's wonderful. We love a baby who follows directions. How long will that last?