This really requires a longer dissection than I can do here. I'll just point out that the Cross and the Eight Powers are both common and important themes in Ueshiba's writings. I'll also point out that these are pointers to specific technical references.
I have no idea who is responsible for the translation Chris Moses cited for this. The kindest thing I can say is that it is an exceedingly free reworking of the original. Not that there's anything wrong with pop lit and Jonathan Livingston Seagull if you like that sort of thing.