You said St Cyril "spent much of his life angry at" someone one another. 
And you want that unsubstantiated claim to undercut my point that one sign of sainthood is joy (formal Church teaching).

So you can't even give us an exact date for St Cyril's birth, but you want us to be assured he had no joy in him at the end of his journey!  And further you want to use that fragile point to say that joy isn't a sign of a saintly soul.

This last point is rather an odd assertion to make.  You're effectively saying that God is not joyful, and/or that His joy has no effect.