Any early notion that you turn or control the direction
of the aircraft with the use of rudder alone is just
not right and will plant the seeds for the stall/spin
scenario later. Also it is important for the first
6-8 flights that the student not have their hand on
the stick during the takeoff and landing.
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I did not write that nor have I advocated "turning ... with the use of
rudder alone." The object of formation flight is to maintain relative
position. Coordinated flight should be accomplished, but not at loss
of position. A coordinated turn with a bank angle greater or less
relative to that of the tow plane will result in becoming out of
position. Primacy for coordination would have the student looking to
the yaw string when they should be looking through the tow plane at the
horizon. Like Burt said, watching the trend.

In showing what the rudder can accomplish, I am contributing to
coordinated flight off tow. When your students perfom "boxing the
wake" how do they maintain the corners while coordinated? I usually
ask for a two count at each corner to prove it is not an accident and I
do not think I could maintain that position in any other manner than by
rudder with bank matched to the tow plane's level wings.

I don't understand you reluctance to allow your students to fly.

Respectfully,
Terry