Some of us were discussing a really interesting academic question recently: given the events that transpire in CE, is there a Masamune sitting in Guardia Castle's vaults in 606AD in the final "corrected" timeline in which the Masamune was restored?
In the beginning of CE, it is established that Glenn gated into 600AD post-CT and laid his Masamune in Guardia Castle
(see 5:09). This timeline is replaced by a timeline in which the Masamune never existed in the Middle Ages, but yet Glenn's post-CT Masamune was preserved by Time Traveler's Immunity when he gated into that timeline's 600AD.
In 605AD, Glenn began doing some temporal travels again, taking the post-CT Masamune with him. Each time he gated in and gated out, he established original gate-ins and gate-outs that would occur in every active (non-DBT'd) dimension: the gate ins brought Glenn and his post-CT Masamune into all universes at specific times, and the gate-outs would cause Glenn and his post-CT Masamune to vanish via Time Bastard at specific later times.
Also in 605AD, King Zeal established his own original gate-ins and gate-outs, and he was equipped with what I'll call KZ-Masamune to avoid confusion. This is the Masamune removed from a certain point in 11,995BC.
All original gate-ins and gate-outs established by Glenn and King Zeal during 605AD occurred in a dimension in which the Masamune never existed in 605AD aside from those preserved by TTI.
After those original gate-ins and gate-outs occurred, the player in CE created a dimension in which the Masamune was restored, specifically by placing KZ-Masamune back in 11,995BC at a point after it had been removed from the timeline in the first place.
Now, in 600AD, Glenn gates in and places the Masamune in Guardia's vaults. Then all the gate-ins and gate-outs established by Glenn and King Zeal are applied to this new "corrected" dimension thanks to Time Traveler's Immunity and Time Bastard.
Is there any version of the Masamune still in Guardia's vaults in 606AD, in this "corrected" timeline?