Can you post the relevant image here so we can take a look at it?
Unfortunately Brackloch is another of those place names that crops up in various places, so we really need to know the parish to find the place. (I promise you it isn't Cipyats!) Though if the census says he was born in the parish of Assynt, that Brackloch by the River Inver looks right.
The birth index on SP says that Thomas Graham's birth was registered in Kirkton Assynt in the County of Sutherland*. Kirkton is probably the commonest place name in Scotland, because it just means the cluster of houses round the kirk, and of course every parish has a kirk so every parish has a kirkton.
*The following is completely off-topic but might possibly be of interest if you are going to Assynt (which I would definitely recommend). You will be amazed by the scenery, which is of course largely dictated by the underlying geology, and in fact Assynt is one of the world's greatest and most significant geological localities. The working out of the extreme complications of the geology of Assynt is largely credited to two men named Ben Peach and John Horne. Their work had major importance for the development of the knowledge of geology, and Assynt remains a mecca for geologists from all over the world who come to study the area. The reason I mention this is because Peach's second wife was the daughter of the schoolmaster at Kirkton Assynt. She was born in Kirkton Assynt in 1868. So if your grandfather had stayed long enough at Brackloch, he would probably have been taught by her father Angus MacEwen, who, incidentally, was also the Registrar of Births, Deaths and Marriages for Kirkton Assynt.
It's a fair hike from Brackloch to any of the other places you have mentioned, but I reckon that the other places are all within a good day's walk of one another. People did move around quite a bit by the 1860s, especially shepherds because when the Clearances took place to make way for sheep, the landlords often brought shepherds in from outside the immediate area.