Let me add to that a bit, more formally. A fourth problem (in my opinion the worst) is that guardianarmy uses a random set of the caster's creatures, regardless of the caster's rituals set.
There was a time, long ago (years), in which it at least used the caster's def rit for the castee to attack with. In other words, when I first tested "attacking myself" at that time, I got the same ritual on top and on bottom. The change to random was unnanounced anywhere as far as I can tell, so it was surely something breaking.
TL;DR: No, it is not meant to be a random rit.
Example of cu