To answer one of you questions. You only need 7 different phoneme's to do Lip sync, but you should probably do more than that.

This is from here, https://www.dsource.in/course/lip-sync-animation/process and as you can see many others are basically variations of strength of the morph. The key is to mix them convincingly. As Charles mentioned you can use emotion poses which is key for making things like inflections look believable. The key to making it look convincing from scene to scene is having more than one set to do this based on differences in emotion that is unique to the character. 

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