Yes, large accounts will hire mm's to accumulate positions... they'll use tactics to get the job done. The large account will always want the best average price. (Kind of like getting stuck at the checkout behind Mrs Smith doing the monthly shop while you came in for an ice cream, if you know what I mean.)
I see that too,, but I have also seen that whin I get a buy fill, it happens the same way.. Sometimes I (most of the time) I will get filled in maybe 1 nice parcial, and the next few amts are in 100 parcial... It's is very strange.