Multi-Signature Wallets: Can you trace and proof which signatures were used in a i.e. 2-of-3 multisignature wallet?

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I recently had a discussion where I made the argument that in order to prevent issues like what happened to LukeDashJr and I made the argument that most likely for the everyday Joe and Jane a 2‑of‑3 multisig wallet will probably be the way to go to avoid loss like this while still retaining sovereignty over one's own money.
The person I was discussing with made an excellen point as in: How would you legally proof fraud?
In a 2-of-3 setup if the third party + custodian collude against the owner of the funds it will not be possible to proof in court that it was not the owner + third party colluding against the custodian, unless you could proof who initiated the transaction.. so:
- Is there a way to tell which signatures were used to create a transaction?