“Why would Catholics even try to canonize non-Catholics?”
Good question... because some roman catholics are heretics and some non roman catholics are not..
and there are many other reasons as well..
You wrote:
“Good question... because some roman catholics are heretics and some non roman catholics are not..”
Effectively, no. No Catholic up for canonization is a heretic (this, by the way, includes Catholics who are not Roman Rite since you seem fixated on using the term “roman catholics”). All non-Catholics believe in some heresy.
“and there are many other reasons as well..”
But you are apparently unable to see the real reasons - as demonstrated by you in your last post to me.