Still more of a fan of the future/alt Harry, in this case welding a coin. I'm pretty sure I can peg down a few instances where you can point a finger at Alt Harry's. Have a few ideas on that, including the premise the "circle" which only Cowl has mentioned is actually the 5 versions of Dresden traveling through time. I'll try not to here though lol, but
Nic has been falling as Harry is in ascent, and they are becoming foils/dark mirrors (Harry gains feal servants as Nic loses his
THIS, This is a thing. I connect it to the spire/endlessly repeating inverted time. To point out a few things, the first time we meet Nic he's dressed in a perfect inversion of Harry. Hat, goatee, light overcoat, nice clothes underneath. Even his actions are directly inverted from Harry's. Harry sacrifices the mother of his child to save her. Nic sacrifices his child in spit of the Mother for selfish reasons, ect.
One along this vein that supports the Harry/Cowl connection is the Raith Deeps. Nic manifests anduriel as a shadow. The mirror to this, would be Harry manifesting Lash as something Flaming... Which is exactly what cowl does when he gets P.Oed at Harry.
Thinking all TT shenanigans are closing the loop on the Harry we have now. Everything they've done, has actually helped the timeline, and we're late enough in the game we can actually see where. Offhand, no atheme means no Mab with a thumb on Harry, SK changes from there, no WK options later, CDs goes much worse, ect.