Would those errors have given the same result as Gerbers errors.
I understand he was a Physicist not a mathematician All Physicists have to do some background to learn about a subject, based on other peoples understandings. Einstein had lots of discussions with other Physicists and Mathematicians. His claim he did not know of Gerbers work and developed his theory separately is likely true. There is no evidence of them ever meeting, or corresponding in any way.
If I recall, there was notational errors Einstein has made in various works, one particular one, if memory serves, for instance, the origin of inertia had at least four corrections when it was converted into English. My point is, that physicists do tend to write errors in their formulas - but keep in mind, the constancy of the speed of light and gravity having a finite speed equal to that of light speed, was known even before Einstein, so there could be a chance Gerber was aware of it and through a sloppy derivation, still came to the right the answer; in other words, it can happen.
A lot of unpublished works by dead ''giants'' of physics, shows numerous errors as well... just wish I could remember half of them now. It seems to me though, this whole issue of Gerber getting the wrong result because of a problem of setting the speed of light equal to that of gravity, appears to be moot since he still arrived at the right result. That isn't an accident, there was a reason Gerber got the result he did and it has been investigated and supported by other physicists - what I find interesting is that Einstein is very quick to call relativity ''his theory,'' when the theory of relativity was largely created before him, even down to length contractions.
It is true, Einstein is not a pure mathematician and in fact required help from his wife to construct the theory of General Relativity. She was however a pure mathematician so this was fortuitous for him without doubt; it stands that this little detail couldn't be hidden and he cannot really call himself the sole author of General Relativity either, even though we tend to think that these days... damn, even the bending of light round objects had been predicted before Einstein.
All in all, its hard not to be convinced Einstein did some plagiarizing at some point and likely from more than one source. His conclusion that Gerber getting the right result as being insignificant because of what analysts have said concerning how he got his result, seems like nit-picking. The fact still remains, Gerber got the right result and it seems to have annoyed Einstein, for some reason, that this fact came to light.