Interesting, never heard of any of these. I used to feed twice a day, but when he started becoming miserable with his evening meal, I stopped feeding the morning meal (only because I have more time in the evenings). As for digestive juices, I guess it depends on the dog. Mine is fed after we get home from our last walk in the evening, and it's about the same time every day. However, sometimes I have to cook more veggies, and it takes time, so his dinner may be 2-3 hours late. Never had an issue.
I don't feed pork because raw pork is a serious concern where I live (Aujeszky's disease). If I was to feed pork, I'd have to cook the meat. Still, my dog has great muscles and great stamina for his age. Since raw pork is okay where you live, do feed it, but make sure that you feed other protein sources as well. Variety is the key to a healthy raw fed dog. I can't help but wonder whether the food you have bought contains mainly pork? Sounds like advertisement to me.