Norm, I cannot open the link.
Hook sizing is a nightmare.
To make life easy I have a Griffin hook/hackle gauge which I use to establish some kind of benchmark.
The hook gauge part lets me see what I am doing when transferring from one maker's scale to another.
As to odd-number designation, I would guess it is a marketing ploy to suggest conformity in an alternate and regular system. That should work in the absence of a standard.
The major pain in the posterior is ordering a few thousand hooks in a particular profile to find that they are in fact a real 12 instead of the 14's you needed.
I have gone to a shop to buy a particular hook, found them on the rack, same manufacturer, different brand, exactly the same hook, the new brand was labelling the 14 as a 16,
Glad I did not send someone else to pick them up!
The Redditch scale still stands as a useful benchmark when discussing hooks via the ether.