Could "a" be a ligature?

[oshfdk]

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How do you think? May the symbol which we transcribe as "a"  be a kind of ligature which is actually "ci"?
Do you think it's impossible, improbable, possible or sure? 

I have no idea, but as far as I remember, splitting 'a' into 'ei' (I think it's 'ei' rather than 'ci', since there is no bar) has a long history. It was mentioned in You are not allowed to view links. Register or Login to view. (excerpt below) and I think something like this was discussed even earlier.

   

Suppose 'a' is 'ei', what are the implications of this?