Questions.
1. Why so many in one area?
Multiple deer perhaps?
2. Do you think my dripper will bring them around the corner to my shooting area?
That depends what you put in it and whether or not the new "scrape" spooks them. Being curious by nature they'll certainly check out you dripper, but odds are it won't be in daylight until you start using estrous pee or buck pee.
3. Should I go ahead and pop another stand in the backyard closer to the scrapes? Theres a great tree with lots of leaves/cover about 15 feet up that would do great and it's not a problem to be in the yard by the house.
I'd just move the existing stand closer to the treeline, the property is kind of small for adding a second "strange object". I hunt mostly on my ten acre wooded property, and it's real easy to bump them off pattern unless I'm very careful. It's also easy to "burn out" a small property.