In a long standing game, the Runners iwll run into both of multiple types throughout their careers.
In my longest running game (lasted years IC and OOC with one character surviving the entire time and two more being extremely long-lived in the game) the team worked with dozens of Johnsons on dozns of jobs and prett ymuch ran the gauntlet of types.
The first few were "Street Johnsons." Schmucks on the low end of the scale, usualy in it for their own gain or own reasons (with revenge being very popular). Then they moved up the scale as they got a bit more famous into a combination of Private Johnsons representing very limited (sometime slimited to just htemselves) interests and "better" Street Johnsons. As they got better and more famous, they added Corporate Johnsons to the list of types and began seeing "Johnson as Johnson" and "Johnson as a Mask for the Real Boss" regularly. They then graduated into top tier work and the return of Private Johnsons of the highest caliber, including gettign themselve beholden to a very powerful CEO who spoke with them directly via telecom and the occasional dragon in the mix.
IMHO, the "level" you're playign at will determine how often the Johnson is the Boss and how often the Johnson is a pawn. At the lower levels, it's just not cost effective to have a pawn Johnson. In the middle levels it will become common, and into the higher levels constantly growing in commonality. Once they graduate into "almost Prime" turf, it'll die off to a rare thing, again, because it's not cost effective.