I have two suggestions, one being an alternative to writing the chords on the board and the other "down time".
First, as a "new guy" I haven't come close to learning the chords of these songs yet.
At the last class I tried to follow other guitar players. Speaking honestly, from where I was sitting, the guitarists who were in my line of sight really had no better understanding of the chords than I.
Therefore, here is my alternative suggestion to the issue of writing chords on the board (which by the way, I concur totally with Dave).
One proficient player of each instrument should be placed to Dave's left in front of the circle. One guitar, banjo, fiddle, mandolin. This way any musician will be able to look to the appropriate instrument and follow the chord progressions. As time goes on, one would only need to glance occasionally if lost.
Next, regarding "down time", I think Dave, as director, should not have to spend 25% of class time focusing on the needs of any individual and honestly, it sort of disrupts the flow. My suggestion above will also reduce this "down time" allowing everyone to play more and be lost less.
Thanks for allowing me to post an opinion. I am grateful to be included in this group.
Kind regards to all,
John