The CPYF utility has some bit of "optimizer" logic whereby one means
of copy is chosen over another. One part of the logic, at least for
the FromFile, is whether there are any locks on the data; i.e. no
data locks follows one path, any data locks [beyond its own] and
another path is followed. If no locks, the CPYF escalates its locks
[beyond just *SHRRD] to use a more aggressive approach to effect the
copy data activity. Similar logic may exist for the TOFILE.?