Basically, they're putting the official in the "NFL-umpire" position, without taking away the currently-existing umpire position. My guess is that it's to help with blocking responsibilities that are currently shared by R and U. With a 'second umpire', you could allow the R to become a "quarterback only" official, and let U and U2 handle interior line play.
Or you could have R take QB + opposite tackle, U take C-G, and U2 take G-T.
LOS and Deep-3 officials keep the same keys/responsibilities as before.
I know the NFL's 8th official experiment in preseason a few years back was adding a "deep judge"... basically a second Back Judge to help with pass play/down field coverage. Must've not been enough of an improvement to implement full-time.
It'll be interesting to see what happens with the experiment.
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