He explains the entire issue in the question above it:
13) So, we have Bird rights to Leon Powe. Does that mean we could sign him to a huge one-year deal, and then trade him to another team as an "expiring contract"?
No. If you give a player larger than a 20% raise, he's subject to something called "base year compensation". Essentially, what this means is that for purposes of trades, you only count 50% of the player's actual salary as outgoing salary for trade purposes. However, the team trading *for* the BYC player has to count 100% of his actual salary for incoming purposes.
I know that's confusing as heck, so let me use an example. Let's say we want to trade Leon for a player making $7 million. We thus intend to sign Leon to a one-year, $7 million contract. Here's how that breaks down under BYC rules:
Boston trades: Leon Powe ($7 million salary * 50% reduction = $3.5 million)
Boston receives: $7 million player
The trade cannot go through, because the $3.5 million and $7.0 million salaries don't "match" within 125% + $100k.
Couldn't we just sign Leon to a $14 million expiring contract to complete the trade, then? No. Here's why not:
Boston trades: Leon ($14 million salary * 50% reduction = $7.0 million)
Boston receives: $7 million player
So far so good, right? However, the next step kills it:
Team X trades: $7 million player
Team X receives: Leon Powe ($14 million salary, with no reduction)
Thus, once again, the salaries don't "match". Base year compensation makes it very difficult (although not impossible) for players to be traded in the first year of contracts where they saw a substantial raise.
The problem is that salaries have to match.
So if we gave Glen Davis a contract making 6 mil... he would only count as 50% of that due to this rule. So he would equal 3 mil outgoing. But to the team receiving him, he counts as 6 mil incoming.
Here's what I want to know.
What if we traded Glen to a team with cap room?
This is completely crazy, unrealistic and would never happen, but what about this scenario.
Portland has like 9 mil in cap room, right?
Couldn't we theoretically give Glen Davis a contract making 8 million and then trade him to Portland for Travis Outlaw (making 4 million).
Boston sends: Glen Davis (making 8 mil)
Portland sends: Travis Outlaw (making 4 mil)
Doesn't this work? From our perspective Glen would only count as 4 mil outgoing... thus we could only take back 4 mil incoming.
From Portland's perspective they are sending out 4 mil and taking back 8 mil, but it works, because they have 9 mil in cap space.
Right?
What other teams have cap room? Wouldn't this also work seeing as the Timberwolves have like 8 mil in cap room? (also completely unrealistic, because the Timberwolves have no need for Glen)
Boston sends Glen Davis making 6 mil
Boston receives Corey Brewer making 3 mil.