Bob said something interesting the other day, that may be insightful here. He said, that at least in his opinion, the IF are not Saints as much for how they LIVED, but rather, moreso how they DIED.
Churches which recognize saints have three reasons for doing so:
1) The saint is seen as someone who can intercede in heaven for people on earth.
2) The saint in his or her earthly life demonstrated SOME quality that is worthy of imitation. This does not mean that they had to do everything well (or no one would be a saint).
3) The MAIN reason is that they struggled to do God's will in their lives. (Whether or not they succeeded is immaterial.)
A saint is not someone who is especially good or kind...it is someone who allows God to work in them.
Therefore, those people who follow these faiths can recognize in the IF (or more particularly in this thread, in the Tsarevich) these 3 qualities & to such people the Tsarevich is a saint (if only because he was resigned to the Will of God & continued to trust in Him despite the terrors and upheavals that surrounded him.
Those people who do not adhere to such faiths don't need to recognize him (or anyone else) as a saint but cannot in all justice say to those who do believe, that the Tsaervich is not a saint any more than they can say that someone else's beliefs are foolish.