What these guys have said is all true. Many folks around the country have CAR problems. We don't at camp because there are no junipers around for miles ( the alternate host for CAR ) so we have no CAR worries. Some areas of the country have serious fireblight problems. Problems vary with your location, climate, soil, and not least - - proper care of your trees !! Sun and good airflow keep diseases in check to a large degree.
Your chart shows Goldrush as " very resistant " to the major apple diseases. It does get CAR, but reports say it doesn't seem to affect fruit. Galarina is listed on your chart as " some resistance ". Adams County Nursery has them recommended in their catalog as having " high tolerance " for scab and mildew. Hot, humid, muggy areas will have more disease problems than cooler, drier areas. To some degree, DR is relative. I've tried to look at 6 or 7 different sources for DR info and then chose the varieties common to most of those sources. It seemed like " multiple heads are better than one " !!
We have 29 varieties spread among 60 trees at my camp. That is to see what varieties do the best in our location. Some may fail, or be problematic, and they will go by the wayside. Ones that are easier, have few problems and produce well, will stay and have a few more planted to fill any open spots. We aren't trying to " one-up " any other apple planters by having many varieties, it's just an experiment with mostly DR varieties and crabs. Nothing wrong with you trying a bunch of varieties. Some of your trees may do real well - where for other folks they don't. Only time will tell !!
EDIT: Our trees are mainly for deer and other wildlife, with some eating by us guys. Not commercial at all.