Sonny may have doubted himself, but I don't think that's the reason he hesitated when looking at the Don's chair.
The vibe I always got from that scene was much more somber. To me...it seemed that Sonny thought that as long as he doesn't sit down in his father's chair...his father will be ok. "Pop'll be back, so I'll leave his chair be."
That's the vibe I got, anyway.
"Growing up my dad was like 'You have a great last name, Galifianakis. Galifianakis...begins with a gal...and ends with a kiss...' I'm like that's great dad, can we get it changed to 'Galifianafuck' please?" -- Zach Galifianakis
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