To check for possible mis-merges, just open the full Change History log for that person and go back in time checking all the changes that were made. Note that if a PID was deleted via a merge, you can still go and look at it. Unfortunately FS has limited several things that you should be able to see on the deleted (archived) records.
If the sources you are talking about are indexes, they can give you SOME of the information, but if they are custom sources, the people creating them rarely add the useful information.
If you are a member of the church, you can open a free Ancestry.com account using your church member ID (it has to be done from the FamilySearch.org website though). It doesn't give you ALL of the privileges of Ancestry.com, but you can use it for searchs in their database and to build a tree which can be synced with the FSFT.
If you do not have the option of an Ancestry.com account, the FHL and FHCs all have complimentary access to Ancestry.com and so you can view the ancestry.com sources from there if you like. Most FHCs are still closed due to the pandemic, but they are starting to open.
Due to the nature of your 'Question' ...
I am "Moving" this 'Question' of yours, in the 'Group' being "Community.familysearch.org Feedback", in this "Community.FamilySearch" Forum, to the 'Group' being "General Questions", in the Forum; so that, the members of that group can further answer/assist you.
That Group is "Public", which you can join, if you wish.
As, that 'Group' being "Community.familysearch.org Feedback" relates to 'Feedback' on the "FamilySearch.Community" Forum", rather than for research help/assistance.
Thanks. That's great information. I jumped in a couple years ago without really knowing what I was doing and probably made the same mistake of failing to log information. On to investigation...
Apologies if I posted this in the wrong area.
This site is very dense and can result in some confusion.
My feedback would be that using multiple "quotes" to highlight my "error" is "excessive". A simple line such as, " I'm sorry, this group is for feedback only, I've moved your question...Thanks" would be a sufficient response.
You have really put me off helping already.
Have a nice day.
EVERYONE that initially "jumps into" this site don't really know what they are doing😀
And if they go without visiting for several months (or years), when they come back, they again will not "really know what they are doing". This site has a reputation that just when folks have figured things out, all of a sudden it can get re-arranged and/or have bugs inserted that can cause folks problems, so the learning curve starts again😟
That is why it is great when folks come here to ask questions. Many other folks can become familiar with the issues and can subsequently assist others.
Brett works really hard trying to provide information for many of the folks that come here with questions, and I am quite sure that he was NOT trying to be condescending or sarcastic in his post (in spite of how it may have appeared 😀)
Brett has some unusual writing styles in his posts that can sometimes cause miscommunications with folks that aren't familiar with him. I really relate to that because I have some of the same challenges myself (i.e., leaning towards verbosity and over detailing/emphasizing). I suspect that he will seriously consider your feedback.😊