This works especially well if they aren't too proud to cooperate with other Wrestling/Judo/BJJ/Whatever schools, since a specialist will always be better than a Jack Of All Trades.
Fortunately with the surge of MMA it seems that a lot of schools identify with neither and incorporate whatever works in their training. This works especially well if they aren't too proud to cooperate with other Wrestling/Judo/BJJ/Whatever schools, since a specialist will always be better than a Jack Of All Trades. So if you have the opportunity and you are striving to be a "pure" grappler, I would highly encourage you to seek out experts of the various styles.