No matter what style you play, having a nice controlled vibrato is essential. It is how we give life to the notes.
For a majority of players having issues developing a consistent vibrato technique, the reason is becasue they are attempting to use smaller muscle groups instead of larger muscle groups. I think you can see this in Erick demosntrations.
I will demosntrate how the finger's job is to simply stay stable on the string, while the power behind the vibrato comes from the forearm by doing short rotations. That way you will have more strength and control. You are also using the weight of your arm to help you with the vibrato.
I hope this helps Erick!
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