As promised, here are some pictures taken today. The first pseudostem was protected with a bag of leaves. The two pups had zero protection, and in fact the entire bed was unmulched for the winter.
I think one reason that the pups survived was that the growing point is well below ground. The original pseudostem died back completely, and its growing point was close to ground level. I think if I'd have given it a little bit of protection, it would have been fine also. No matter though! I think this one will be quite large by mid-summer.