It is not a secret that there are countless poorly sourced profiles in Wikitree. Many -- probably most -- instances of tangled family trees involve insufficient sourcing.
There are few among us who are not named profile manager on some very poorly sourced profiles. There should be no shame in that, and mention of those profiles as poorly sourced should not be received as personal criticism of the named profile manager. And if we couldn't discuss problem profiles openly, much less progress would be made in resolving our knottier genealogical questions.
If Mark is having difficulty working with another individual, that should be treated as confidential, and he should refer to Help: Problems With Members. However, because he asked for a Data Doctor to write to him, I have to assume his issue was with website features or genealogy, not an interpersonal conflict.