just to clarify, the ink bold is the eq. of sapphire preferred and regular ink is eq. to sapphire and ink cash to freedom?
Not quite, the Sapphire Preferred offers double points on dining and travel, and no foreign transaction fees, it also offers a plethora of protections (e.g. purchase/warranty/return etc.) that I don't think the Ink Bold offers. The Ink Bold offers some sort of Priority Pass benefit not offered with the Chase Sapphire Preferred.
There are probably other (subtle?) differences between the other cards, like different bonus categories on the Cash/Freedom. There's also the 10 points per transaction on the Freedom for Chase banking customers, I don't think this is offered on any of the business cards.