Turbo Tezzeret ran 2-4 Opals, 2-3 Sensei's Tops, and 0-4 Grim Monoliths. That's almost exactly the configuration for PO decks. I don't see how you think Turbo Tez is a precursor for Thieves, and not PO. The only real functional difference between PO and Turbo Tez is 4 PO instead of 3-4 Tez.
I was trying to let this go but this bugs me a bit. PO decks look very similar to Xerox decks with the exception of less counter magic plus Mox Opal and PO.
The Tezzeret decks were really just mana drain decks that played the same strategy we see in Grixis just without the Red.
Xerox decks run 18-22 mana sources. Big blue mana drain type decks like Slaver, Gifts, Tez, and PO run 24-28.
Xerox decks run tempo finishers like Mentor, Pyromancer, Dryad, and Delver. Historically they run 4-8 such creatures. Big blue decks, and contrast run 1-3 late game win conditions, like Serra Angel, Morphling, Tezzeret, Tog, Tinker Bots, etc.
PO is not - and has never been - a Xerox deck. Just because it uses preordain does not make it a xerox deck any more than when DPS does.
If you line up the TurboTez deck it’s almost identical in form and function to PO decks.
Grixis thieves is just the latest version of the Bob /Jace big blue deck, which came into existence when thirst was restricted, The Tez players replaced thirst with dark confidant.