Unfortunately, these are also three of the four key positions of any NFL team. In general.
These have come to be known, for the lack of a better or the correct term, cornerstone positions. You can have
average talent basically everywhere else, but if you have these three plus a lock-down/leave on an island type DB, you
can build around them:
There are always exceptions, and other ways to do it, but from what I have come to understand if you DON'T have
these bases covered well, you're going to have to rely on a super unit somewhere on the field, or some other way to
generate mismatches to get wins.