Fair enough, but he makes some excellent points here. For starters, why was Data allowed in Starfleet in the first place if the question of his sentience was never settled?
MADDOX: How have you been, Data?
DATA: My condition does not alter with the passage of time, Commander.
PICARD: The two of you are acquainted?
MADDOX: Yes, I evaluated Data when it first applied to the Academy.
DATA: And was the sole member of the committee to oppose my entrance on the grounds that I was not a sentient being.
PICARD: What exactly will this work entail?
MADDOX: I am going to disassemble Data.
This suggests to me that the rest of the committee was prepared to accept Data's "sentience" on faith, so Bruce was outvoted and made to drop the matter until he was able to leverage other (more senior?) contacts years later.
Moreover, the idea of Louvois summarily ruling against Data if Riker refuses to argue against him is ridiculous.
Agreed, I'm no expert, but I'm pretty sure the de facto finding on any "appeal" would be to uphold any original finding.
On top of that, Riker rightly should not be arguing a case he so vocally opposes. (Maddox could've claimed that his case was hindered by Riker's bias against it). There was no "ticking clock" here, and therefore no "in universe" reason for them not to wait for counsel to arrive.
Absolutely not, particularly as Riker doesn't have any legal training, so using him is a dubious choice in the first place (logically the state case should have been given to Louvois' assistant) if it was somehow urgent (highly unlikely)