Do you believe they should worry more about the type or color of the specimens?
Do you believe a good quality drake or hen is more beneficial to keep around?
What are some traits that would automatically knock out a specimen from your breeding program?
What stage in a breeding do you believe is the best time for mixing in better quality Breeding Stock with Hatchery Stock?
Also any other input or personal experience would greatly be appreciated.
To answer your question directly:
Color is a critical component to type in waterfowl, so you must worry about both.
A drake has much more influence because he will sire multiple hatchings from several different ducks. However, if you can get your hands on a super quality duck, you can manage your hatchings so her eggs are the ones you hatch for your next generation. A top quality duck is a real blessing to anyone who wants to produce top quality ducklings. However, I would purchase a quality drake to upgrade a pet flock, but would not purchase a quality duck and then breed her to a pet quality drake.
Automatic cull for me; Poor temperament. Any health issue. Even a hint of weak wing tendons (angel wing). Laying problems. Any deformity. The misfortune to be an excess male.
Add better bloodlines immediately. You can't start too soon. And cull, cull, cull.
Personal experience with breeding up waterfowl:
I have show quality Blue Swedish ducks., They are pretty decent, but could use some work. These are the best ducks I could find, so buying a better drake probably is not going to happen. The world is full of pet quality bib marked mutts and there are barely any show breeders of Swedish ducks. Stock simply does not exist. I will buy it if I find it, but so far, nothing.
I cull my birds and keep the best. I have forgiven some color faults. My birds are too narrow across the back, and my widest drake lacks the white wingtips. I want his broad back more than I want the white wingtips, so he stays and I hope he will broaden up my flock.
The rest of the birds all have their white wingtips, so I will hope there is no loss of that gene. I will cull to keep broader backed ducks with white wing tips.
It's a balancing act. If none of my birds had white wingtips except for one, who was too narrow in the body, I would keep him for his white wingtips and he would be used extensively white I got the correct wing color established. But again, I would be keeping the hatchlings with the broadest backs and also white wingtips.
Some faults are very difficult to get rid of. Mottled bibs is one of those in Swedish, so any bird with a mottled bib, or eye stripes, is out of the program. I can not afford to allow those genes to creep in. With those 2 issues, I don't have them and I don't care what great genes a bird has, I am not allowing those problems to get mixed into my gene pool.
I suggest that you do not concentrate on one trait at a time, but select the best over-all for each generation.