#3 Allows WWE to connect with the 'NXT' audience
Vic Joseph is really good at what he does, but he is seen as little more than someone in a suit who represents WWE corporate more than fans. Similarly, Jerry Lawler is one of the greatest in history, but unfortunately, he feels a little outdated in the year 2019.
We all know that there is a certain section of the audience that prefers AEW to RAW and SmackDown. Among the products under the WWE umbrella, they prefer NXT to what has been traditionally referred to as the 'main roster'.
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This audience will find it easier to connect with someone like Samoa Joe as compared to the other gentlemen at the booth. To just put it plainly, Samoa Joe is cool while the other two men are not!
Samoa Joe has the edge that other announcers lack. Maybe Corey Graves is the only other WWE announcer who represents this particular section of the WWE Universe.