Khalifa Umar(ra) -- Split from Praying under influence

all these are no more than guesses,
bottomline is that Ali [as] married his daughter to Umar [ra] and even more than that the degree of involvement of Ali in Umar’s govt is significantly more than with the govt of uthman or abu bakr[ra].
Umar[ra] also had the highest stipends from Bayt ul mal for Prophet[pbuh] 2 grandsons i.e the sons of Ali [as].
Something you would not expect from someone who allegedly kicked Ali’s pregnant wife to death !