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 the more complete the digestion the less smell and the less complete digestion the more smell 
 It would make more sense to me being the other way around. 
 undigested food rots somewhat on the way through and bacteria eats it and makes more gas.  this is particularly true with carbs that don't digest or human-indigestible carbs (sugar alcohols for example).  if it's fully digested (and absorbed) it's mostly fibre coming out.

I had massive problems (celiac) about 20 years ago with digestion, went to a doctor specializing in it.

 
 Aww the truth is not as fun as the speculation sometimes I suppose. Glad you got it sorted, celiacs is fucking gnarly 
 it's complicated though, gas.  what I said is surely not the entire story.

last fall I was super into winter squash.  my husband wasn't into the farts that resulted. 😂 I cut back and it went away.