There is no legal judgement, no. But the precedent has not been broken or altered, so there doesn't need to be. Legal judgements are helpful when there is no precedent to resolve similar issues in the future.
No club has been able to sign a contracted player without paying a fee, which is what Sale were trying to do, unless this has been agreed by both clubs. This is still the case.
Perhaps another RU club will try the same in the future, and it will be up to the club concerned (and the RFL) to enforce the precedent again. But I bet they don't try to on with Castleford.

If a player walks away from his contract, why would he give any weight to any clauses within it?

The only route for that to be enforceable would be with the agreement of the RU to not accept their registration. If the RU & RFL had a reciprocal agreement to support this then it might be viable, and beneficial to both codes.

Take a look at Sale's statement on the D.S saga on their website.

I am gobsmacked!

If Mr Diamond or Sale claim they haven't done anything wrong, then why have they agreed to compensate Cas for some of their legal fees.

Official Sale Sharks statement here :- www.salesharks.com/news/5197.php#.WUqh6WgrLcs

Official Sale Sharks statement here :- www.salesharks.com/news/5197.php#.WUqh6WgrLcs

To me it looks like Sale's intention was never to sign the player without paying a fee, basically it's cost them an extra £100k for the legal fees over and above the £200k they originally offered Cas. So my take on it is if a player wants to go, and you've been offered a sensible figure for him, then it's easier all round to take the offer. Maybe not the most principled stance, but then settling for the original offer plus legal fees isn't all that principled either!

Basically to remove uncertainty the risks associated with the case created. Both sides have actually demonstrated thinking in line with modern behavioural economics theory. Sale faced the risk that they would lose and would have to pay £600k (£500k Cas valuation plus 100k legal costs), so they settled for half their exposure which was the £300k (£200k Sale valuation plus £100k legal costs). Cas faced the risk that they would get nothing for a player the market valued at £200k (Sale's bid was the highest bid from the market) plus incur an extra £100k of legal costs if they lost. So Cas basically removed their risk and got the market value of the player with no legal costs lost (even if Cas valuation was above market value). What we don't really know is the probabilities of the various outcomes had it gone to a legal decision, which makes it hard to know who got the better deal, if indeed either club did (I'm ignoring the various moral arguments on either side here). Cross code rugby disputes as a case study in behavioural economics! Who'da thunk it?

Just makes it a bit easier for clubs without the cash for an expensive legal fight to have something in writing that makes it a lot more clear cut.

Diamond seems to forget what he has said previously and what was published as part of the court case.
An email was sent from Diamond to Steve Gill withdrawing the 200k offer and reducing this to 50k. I assume Diamond has forgotten this, as he now claims Castleford have not gained financially by taking the case through the legal process. Even the most basic maths says that the difference between Sale's offer (50k) and the settlement (in excess of 200k) means Castleford have gained financially.
Diamond is also on record in the press as saying Sale were entitled to sign Solomona for free as he had retired from RL. Given his previous comments, he therefore looks at idiot claiming that a 200k (plus legal costs) is a successful outcome for Sale.

Is it not clear-cut already? Signing an RL contract clearly prohibits playing another sport (one would hope).
If a player is going to walk away from a contract, he's not going to worry about the content of said contract.
Unless of course a punitive financial penalty is included as a clause in the contract that the player would be personally liable to pay (perhaps 10x salary) should the player breach their contract.

Tigers got 205K for DS - so that is a decent result IMO although I was expecting something in the region of 300K.

The big result for me though is how much Sale Sharks have had to pay-out.
205K plus both legal teams at 110K each. 425K - thats one hell of a bill.