Hi Ontchick
Questions I'm afraid:
What is your primary source (ie OPR,) for Alexander Fleming's birth at Craganfearn in 1799? (He wasn't, I promise!)
What is your primary source for the birth of John Fleming at Craganfearn circa 1769? (He wasn't either, on both counts.)
What is your primary source for the marriage of John Fleming and Janet Ross. (The IGI is not the primary source.)
What is the connection between Flemings in Logierait Parish (probably not Craganfearn,) and Flemings at Atholl (separate Parish, several miles away.)?
The unnamed Fleming born 1736 is likely to remain unnamed as it has for the past 270 years, so for your purposes is 99.9% useless. Your possible line of descent will be through the other 3 brothers. You have at least two, possibly three, missing generations between Alexander and Thomas and Elspeth. The only way you will sort this out is by lookiing at primary sources which are located at Perth and Blair Atholl. No amount of gazing at the IGI is going to sort out your family back into the 18th century. Can I suggest that you invest a few dollars and write to the AK Bell library in Perth and ask them to do the research for you. It will cost you but it will get either rid of, or set in stone, all your suppositions. There is no guarantee that the information you seek is even available, but only by going to the fountainhead wil you ever find out. The ladies at Perth are both charming and very helpful and there is a stack of sources there which will help you.
Sorry to play devil's advocate, but if it's the whole truth you are after there is really only one way to find it. Ignore the 'legend' for the moment and try and find your real family. If all of a sudden the legend fits the known FACTS then so well and good. If it doesn't, forget it!
Tickle