Most of the good ones from DS should have made movie careers and TV. The only actor I see as strictly theater was Jonathan Frid.
KLS, Thayer David, John Karlen, Dennis Patrick, Louis Edmonds, Clarice Blackburn (all very solid character actors and some exceptional)...probably it was just luck of the draw as is with most actors, it seems. As has been already discussed in this thread, many did have solid acting careers, of sorts. John Karlen, Thayer Daivd, Dennis Patrick, Kate Jackson, Jerry Lacey (didn't he do Broadway as Bogart?) were working actors who probably made a good income with it....all of the DS group had potential to some extent. Though - I wonder, as Lara Parker was so amazing as Angelique, if she was a bit typecast. I think Lara Parker is good but not so much as JF who could have broke his typecasting with sheer talent, if the theater projects had come his way. I'm annoyed with myself for missing opportunities of his one man shows. I wasn't even aware of him at that point, and now I think he's totally retired. My loss.