We have crossed the Rubicon. It is utterly impossible for a non Catholic to be a saint because there are no non Catholics in Heaven. How can a non Catholic show the primary heroic virtue of faith? I also love your linguistic gymnastics here. What I suspect you REALLY mean by "rules", in the broader context, is Divinely revealed truth/dogma. To that end, insofar as these "rules" reflect God's will, the Church is duty bound to follow them. And why are you citing schismatic publications regarding the form of the bread? Who cares what they practice or think; the extent of our formal contact with these poor souls is to convert them, not to replicate their errors.