It is almost 10 years since your post. Probably by now your inquiry about the location of Drainie has been answered. I can provide further details if you like.
What brought me to your post was John Ross, your ancestor. My great- grandmother, Margaret Lamb, was the mother of a John Ross, whose father was Barnet Ross. This John Ross was born in 1875 in Lossiemouth in which Drainie is a part. His birth can be found in ScotlandsPeople as John Lamb.
I wonder if there is a link to your John Ross. Looking forward to hearing from you.