They could have done Captain Blood in technicolor. Although I understand the risk involved,as Jack was already sticking his neck out,by starring 2 unknows in a big production to begin with. I hate that The Sea Hawk wasn't done in color...not to mention de Haviland isn't in it. Missed opportunity there. I seriously wouldn't doubt it was Kalmus they didn't want to deal with. Boy was she a pain in the butt.
Yes, someone should make a documentary on the Kalmuses. They certainly were interesting.
I don't mind Brenda Marshall in THE SEA HAWK. Of course, Errol would work with her again in FOOTSTEPS IN THE DARK.