Waht’s This?

It’s supposed to be Mizuna, maybe from a packet named Kyoto Mizuna, but I’m not sure.  I buy from a couple of sources and not sure which package I used this time.  Even Kyoto, which is supposed to have fatter leaves, does not have rounded serrations.

I reordered and will throw out all other packages in my stash labeled mizuna, but what do I do with these plants?  Do you think they are some other kind of mustard (mizuna’s family)?

not mizuna?
not mizuna?