Back to the CH/Licker discussion:
There's nothing which states that the Lickers are a product of the V-ACT. Since there's nothing pointing to that conclusion, why did you think it's that way?
If Lickers are a later stage than CH's, why in RE1 we see lots of CH's, but no lickers (those zombies were there fgor a long time)? And in Raccoon city, which was infected much more recently, we see lots of Lickers but no CH's?
You never see CH's being related to Lickers in the whole series.
I think the V-ACT strain was created from the first CH, which was after Birkin left the Arcklay lab. It's cleas that different versions of the virus were used in the different outbreaks, this is clear by the means of transmission ans infection, the BOWs produces, the files, etc.
Biologically, it would be really improbable that the t-virus could put you through all that, it's better that each version has specific efects.
I really don't feel like disserting about this subject, Capcom doesn't take a clear position in this, so it's all open to what you think suits the facts better...
Are the Reapers accidental? I thought they were engineered, gotta take a look at that. The Lickers in RE5 are also engineered.