Interesting thought, yadda.
However, John 8 is not a criminal case being heard in the Sanhedrin, but Jesus addressing a crowd ('testifying' AKA preaching). The Pharisees were pointing out that Jesus was engaging in 'special pleading', and appealing on his own behalf as an individual.
Jesus also is seen engaging in evasive word games, relying on the ambiguity of the meaning of the word 'father': he didn't clarify whether he was talking about his mortal 'father', or referring to God. The crowd was left wondering which, since to claim to be the son of God was blasphemy (a stoning offense). That's why they asked him point-blank where his father was, in verse 19; Jesus gave them an evasive answer.
(Whether God or mortal father, Jesus was claiming to be the son who acted on behalf of the familial patriarch by serving as the redeeming agent authorized to act on the father's behalf. The redeemer (Hebrew word, go'el) is the same concept of a son (usually the eldest) who acts on behalf of the father to say, avenge the spilled blood of a member of the clan (the father was older, and would pick a younger member to chase after the killer of a member of the family), or to prevent a relative from being sold into slavery by paying off their debts.)
By John 10, people had enough of Jesus' evasiveness, and said they weren't stoning him for "his good works", but for blasphemy, claiming to be the 'Son of God'. Jesus came back by quoting Psalms 38, the passage where flawed mortals who acted as if they were 'gods' didn't intervene for the poor and downtrodden, etc, as Jesus had (eg feeding the masses, healing, etc). Jehovah refers to these mortal men as "Sons of God" in Psalms, so Jesus raises a valid point to defend against the charge of blasphemy.
(BTW, notice how Jesus often says, "your law", as if it doesn't apply to him, too.)
Per Pamela Barmash (a lawyer and OT scholar) in her book "Homicide in the Biblical World", Mosaic law generally didn't place any weigh on physical evidence in any significant way, for obvious reasons: forensics wasn't even a twinkle in the eye at the time of Moses. Hence the concern was not finding the actual guilty party, but mitigating the guilt incurred on the inhabitants of Nation of Israel by engaging in rituals (like the red heifer) to redeem the guilt.
There's a parody YouTube video that illustrates the point quite well (WARNING: contains many cheesy puns):