I think the Qingdao dumpling lady, whose departure was much mourned on the board, has resurfaced at Mulan.
I had dumplings at Mulan about a month or two after they opened, and they were terrible: large, thick, doughy wrappers, and a small amount of bland filling. Admittedly, they had shrimp, and I'm not a big shrimp fan.
I've avoided the dumplings ever since, based on that one experience, but on a friend's recommendation ("they taste like Wang's dumplings") I had some pork and leek dumplings yesterday. They do indeed taste like Qingdao's dumplings, and like Wang's (which is run by people who used to work at Qingdao, or so I've heard). The wrappers are thin and smaller than before, the filling is properly seasoned and has a good flavor, and fills up the wrapper.
Also, comparing my old takeout menu with the one online (link to specific page below), they've added pork with string bean dumplings recently. The only other places I've seen those dumplings are Qingdao and Wang's.
Obviously a larger sample size is needed...
Oh, and I enjoyed the "shredded pork with green mustard" (xue3 cai4 rou4 si1) yesterday. Tastes homemade; interesting texture contrast with the soybeans.