If grip fighting was a concepct you study in math class, it would be something like finding the least common denominator in fractions before adding or subtracting them. You might remember that from the 5th grade. Maybe that's not the best analogy. Maybe grip fighting is more like conjugating verbs in Spanish class. I think you get what I'm saying.
Maybe you don't get what I'm saying. The grips - they aren't the flashy stuff of BJJ or grappling in general, but you need them to be solid and right before you implement techniques like takedowns, obviously, and less obviously, like pass and submissions. And, yes, they're boring to drill (for many of us).
Below are a few Judo drills from 2X US Olympic Bronze Medalist and one of the best American Judokas of all time, Jimmy Pedro, illustrating some technique as well as concept behind grip fighting. The theory behind this judo-based approach can easily be applied to grips from the ground in advance of sweep and submission attempts (Marcelo Garcia uses technique like this all the time).