FWIW, Wyman's position is only slightly more vertical than my favorite, Jack Casady, who often uses a very diagonal position off the right hip:
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Basically the only way to hold a JC bass really comfortably when standing, and (to me) makes proper left hand positioning far easier than horizontal playing. It's just the right way to do it. IMHO. YMMV.
That's what I was saying in the earlier post, about having the the neck in a more upright angle. More similar to an upright bass. I changed my playing position to be more on my right hip, and the neck more upright a few years ago. it's worked out fine. It works out really well with having short arms, and playing a Ric 4003W. Easier reach to the head of the neck.