The main reason you don't want to do that is because Chaos Thrust is so good that sharing Disembowel doesn't do anything for you, barring exceptional circumstances (like in 24P instances, maybe you're hitting an add and someone else is ignoring it). Full Thrust combo is just filler. Not considering oGCD buffs, you would legit only suffer a couple % DPS loss for using Chaos Thrust combo in place of Full Thrust combo, that's how good it is.
Welcome to the forums... don't believe everything you read here!