Roy,
I feel like we may be talking across each other. I hope your colleague is also reading this thread.
Your colleague is correct in his statement that the Revision History of one profile is lost when two profiles are merged.
This is not the same as Sources or Data or text in the About section, all of this information is preserved when a merge occurs. If the two profiles being merged both have information but the information does not match this creates a Data Conflict.
For example profile A is born circa 1957 and profile B is born December 1956, when A and B are merged the software will compare the two dates and see that they are not the same. The date of circa 1957 will be displayed on the profile but the alternate date of December 1956 is not “deleted” Geni’s database preserves this alternate date as a “Data Conflict”. This “lost” data can be “found” by checking the ACTION menu of each profile if there is a data conflict on that profile then there will be an option in the ACTION drop down menu called “Resolve Conflicting Data”, choosing this option will give you all the options that have been in the original profiles.
It is possible that a Data Conflict was created during the merge and then someone has resolved the data conflict to a value that your colleague doesn’t agree with, if so this change _will_ be recorded in the Revisions History.
The Revision tab is found immediately below the profile manager’s name, just to the left of centre of screen.