I think that both men are holy. They simply represent the different sides of our Lord: one loving, one stern; one forgiving, the other doling out eternal punishment.
In any case, the people misunderstand them both. They expect miracles of them – as if miracles will show them the proper way to believe. Did you witness the monk from St. Sylvester? He bustles about, from Zosima to Ferapont, eager to see which one will perform the greater miracle. But in looking for miracles he misses the point. Consider which is the greater miracle: that the “Holispirit” appears from time to time to a monk who is fasting, or that the Holy Spirit lives among us everyday, unnoticed but nonetheless enriching our lives?