The match tells you if it is allowed. The delta tells you if it is smart.
The apron rules cleared as a gate, then the Team KR delta as the grade.
A trade can be perfectly legal and a total giveaway.
The salary match asks one question: do the numbers line up. It does not ask whether the deal makes you better. Both reads run at once. Here is a composite trade that clears the match cleanly, and is a giveaway anyway.
The salaries matched to the dollar, so a machine that stops at legality calls this a valid trade and moves on. The read keeps going: valid, and a bad one for Team A. Legal and smart are not the same word.
Illustrative read on the real legality-plus-delta structure. Composite teams and players, demonstration figures.
The same framework is legal for one team, forbidden for another.
Cap rules do not just price a trade, they decide whether it can exist. Above the second apron a team cannot aggregate salaries, cannot take back more than it sends, cannot include cash, and its future picks freeze. The same deal that works below the line is stopped cold above it.
This is the half of the game the value read never reaches, and the half most tools get wrong. A deal is not good or bad until it is first legal, and above the second apron the rules erase whole categories of trade. The CBA is enforced state by state, so you never spend a week building a trade the league will not let you make. The apron is a wall, not a tax.
Illustrative read on the real apron and CBA-legality structure (aggregation, matching, frozen picks). Generic team situations, demonstration figures.
A great trade solves a different bottleneck for each side.
The best deals are not zero-sum. Before value is graded, each side's real bottleneck is diagnosed, whether the trade solves it, and any picks priced as bets with a size, not as a flat sum of ratings. Here both teams get better, because they needed opposite things.
A rating-sum would call this close to even and miss the point: a contender buying its playoff creator and a rebuild buying youth and picks, each solving the exact problem the other could not use its own assets to fix. Both deltas are positive, because the trade was built on the diagnosis, not the swap.
Illustrative read on the real both-sides diagnosis and pick-as-bet structure. Composite teams, demonstration figures.
A valid trade and a good trade are not the same thing.
Clear the gate. Then read the grade.
Enforce the CBA, then read the deal through each team and its diagnosed need.