Soggadu - I know the V you referred to was Veni but let me give my 2 cents too

EB1 usage is extremely low (CO words) and hence
they have tons of spare visas left already. It is so low that even if demand picks up in Q4, they would have plenty of spare visas left. These guys are super conservative, so if they had 12k to spill over as of April,
I'm guessing they likely would have at least 18k for the FY. They obviously want to maintain a cushion in case demand picks up and hence the 12k. Hence the movement.
The next few months should see the remaining EB1 spill down + EB5 + EB2 ROW.