I dont think any MM is accumluation or taking any kind of position on a stock..... they are just middle man that ensures a buyer/seller transaction...

its like saying that the Vegas sportsbook is also putting wagers on games.... no they dont... they make lines so that both sides of a game can bet on the result... Vegas could careless who wins...so long as betting is close to even or that the lines are adjusted if the too many of one side is taking action....

NITE is on the bid and ask... whoever is selling at the bid they are taking... and then turning around and selling it to traders who are buying at the ask.. no need to take a position and make the money on the spread...