About the Red and Blue color being different from Purple and Green, maybe it looks different because it is stored in this double helix vial which is different from the common vials, green can look like blue and purple similar to red.
Also that part where you mentioned Wesker retrieved the G-Virus from Birkin's carcass maybe right, but what if it was Ada and not Wesker? Seems to me Wesker only orders her to retrieve the sample.
And perhaps that double helix vial was necessary to retrieve the sample from Birkin´s remains
We don´t know how exactly this is done, maybe that is why the sample looks different too, that is in case it is really taken from birkin´s remains and not the other theory of the g-virus agent and anti-agent sample.
However, you are right that the colour change could be due to Birkin's remains. But that still doesn't change the fact that Ada can't teleport to that tunnel.
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