I am not aware we are supposed to be ranking the caliphs in terms of how spiritual and close to God they were. The order you have listed here is the order in which they held a caliph position.
-If Ali is a “gate of knowledge” , then this means sunnis accept the concept of “sainthood”, “imams”?
-Can’t an “imam” be just someone who leads a prayer? That’s all I thought they were, people who led prayers.
-Can’t one be a scholar and develop a closeness to God and not be from the Ahl-uh-Bayt? And if this is the case, then why do we automatically assume every progengy from Ali’s blood line is an Imam, and that the entire blood line is pure? Maybe Rasulullah prayed that Allah grant purity to his “family”, but does this include unborn future generations from Fatima and Ali (R’)'s lineage?