You have this backwards.
A percentage of the player's salary goes into escrow (holdings) until the end of the year. If the BRI is lower than expected, the owners take back a portion of the escrow funds to meet the 50/50 split agreed to in the CBA - while the remaining is distributed to the players. If the BRI is higher than expected, then the players get all the escrow money & the owners pay additional to the players.