I'm in no way shape or form saying that Sark is the next Saban... what I am saying, however, is that it may still be too soon to tell what he is. In Saban's first 7 seasons as a HC his record was 51-30-1 with zero 10 win seasons. His first 10 win season was yea number 8. He only had 3 seasons out of his first 9 in which he won more than 8 games (9, 9, 10), and he didn't win his first title until year 10.
Sarks record over his first 7 full seasons as a head coach (not counting half season at usc) is 48 -40 with one season over 8 wins (9).
He very well may fall flat on his face... but what if he doesn't? Some coaches just take a little while to get rolling.