p.s. looking at that Service Training pic, this lower a-arm (link 5; the radially soft bushing) does indeed fix the toe-out problem under braking. So that pic really makes sense!
It also shows why the outside wheel toes in when cornering. There are 2 effects: (1) the height compression of the suspension causes toe in, and (2) the side force causes additional compression in Link 5, which causes yet more toe in. The exact opposite happens to the inside wheel. Brilliant.
Thanks a ton Bill.
(but I'm still confused why both of the lower a-arm bushings look the same. I'd expect Link 5 would look more rubbery than Link 1, but no, they look identical.)