This is ridiculous. Don't you think that other
players such as Andrew have played on many many packets
written by John Nam? If, which i doubt, John's (or
Josh's) packets offer any advantage to those familiar
with his style or personality it would probably apply
to those persons as well.
Second,
This
whole idea is ludicrous, at the very least applied to
any person who has written more than a few packets.
The worst I do at practice is on packets written by
my boyfriend, his performance is reciprocal on my
packs.