If you are in a cover band, a studio bass player or just someone you hired for backing a solo artist etc ... yeah you need a jazz, a precision, a stingray, a fretless and a modern 5 ...
if you are in a original band or solo artist ... well you shouldn't ask that question
I mostly agree with this. If you are a cover band or studio musician, you could get away with any one of the "big three" (basically Leo's three creations) - a Precision, a Jazz, or a Stingray. After the big three, the first to add would be a Ric.
Once you have a Precision, a Jazz, a Stingray and a Ric - IMHO your basses are covered (pun intended). Virtually everything else is inspired by one of these 4.
Sure you can have a Warwick or a Lakland or whatever, but almost every other bass is a derivative of one (or more) of these four basses in terms of PUP configuration and basic sound.
My Lakland for example (which I love) has a MM S pickup configuration with the ability to isolate the coils on the MM pickup. In practical terms that means I can make it sound like a Stingray, or like a J Bass (but always with a Lakland quality to it). So I love love love that bass, but it is clearly a derivative which was inspired by one of the big four,
