I'll start with the second sentence: California law says nothing about a move-
in inspection.
Civil Code section 1950.5(f) provides that, "[w]ithin a reasonable time after notification of either party’s intention to terminate the tenancy, or before the end of the lease term, the landlord shall notify the tenant in writing of the tenant’s option to request an initial inspection and of the tenant’s right to be present at the inspection."
Unfortunately, it does not say what happens if the landlord fails to give such notification. It's possible that courts have held that failure to give notification means the landlord cannot deduct from the deposit for damages that could have been fixed. One would need to do some case research on that issue, although it's possible that some law firms have published articles on the subject (which could be easily found by googling).
As for the first sentence, I'm not quite sure what you're saying, but the landlord not doing a move-in inspection won't have squat to do with his/her credibility in court.
Of course not, but that's beside the point, and you obviously didn't need your landlord to be involved in order for you to document the condition of the premises when you moved in.
Yes.
Who is the defendant in this hypothetical lawsuit?