just a thought here and I could be WAAAY off, but something to throw into the mix: It could be wrong, but still lead one of you guys into a new train of thought that could lead to something right.
Here goes: follow me and let me know if I'm making any sense at all
The Banzain (or the 3rd stunt the Banzain was cast from) was cast from the ESB hero before what we now call stunt 1 and stunt 2. Now here's where the fun comes in: Additional damage was done to the ESB hero through mishandling or caused in the casting process of making the Banzai or making other unknown casts. Now with this added damage the ESB hero was cast again to make Stunt 1 and stunt 2. which accounts for the similarity to the ESB hero above the brow and differences below the brow.
or
?