That's a very good point, but then the defect could not (or should not) be consistently replicated when hubs, suspension arms and so on are swapped with other parts. Not sure if you read my entire saga, but at some point I replaced the Tamiya suspension (arms, hubs, camber links) with Xray items (on the Tamiya bottom plate chassis) and the toe difference was still there.

More to the point, the problem should transfer to the other side if you swap the entire suspension setup left to right. In my case, the problem was consistent on the same side (I assign the problem to the side that had a different toe to what the blocks should have set by Tamiya's own documentation).