So you mean civil law rather than criminal law.
If it's clear which side is right, the quality of the lawyer isn't going to make any difference as long as they present all the evidence. But if it were that obvious, it wouldn't end up in a trial. If you know you're going to lose, it makes far more sense to cut your losses and give in so you don't spend even more money on your lawyer.
So a case that goes to trial is going to have good arguments on both sides, and in civil law, the judge has to decide on the balance of probabilities, unlike a criminal case where the court must only convict if they are sure beyond reasonable doubt. So the question is who is more likely to be right, and the way each side presents their case could tip the balance.
Yes, it's a matter of what's legal and any lawyer should know that, but then it is a matter of applying this to the facts of the case and how the lawyers present those facts matters. No doubt each side has a different version of what the facts are. The judge needs to decide who is more likely to be telling the truth. What sounds reasonable and credible? As Judge Judy so often says on her show, "that doesn't make sense, and if it doesn't make sense it isn't true". If the side that is in the wrong nevertheless manages to present their case in such a way that it DOES make sense, that could be the clinching factor.
Lawson is an unknown brand and I think you're throwing your money away. There's no way to sell a quality 12 string electric acoustic at that price.
Takamine makes a lefty 12 string, the EC40C-12AN model. It's more than the Lawson but at least it's a known and respected brand.