You said: "... then it should go with and stay with the citation information. This is the correct placement of this information.."
No, it isn't. The person presenting the information always has the option to put the info directly into the sketch of the person or the source text information. For example, the followng textual informations may be desired in the sketch of a person.
John married Sally Smith on 05/18/1853 by the Rev Wm Clark, witnessed by parents: Joe & Betty Jone and Tom and Jane Smith. (then the footnote given for this statement only gives the source - ie where to find it info. period, nothing else.)
Or, the text can say:
John married Sally Smith on 05/18/1853. (then the footnote citation text gives the officiater and the witnesses.)
Where to put the info is a choice by the person presenting the info.
You said "FTM does a very poor job of helping newbies understand what information should go where, but then I feel they don't tell users what to do because they have no clue what the right thing to do is anyway."
I'd second that statement.