At a uni it's more conceivable,
I disagree. Thousands of students at any university at any one time. Different courses, faculties, colleges, clubs personalities. Any given student can only ever know a small percentage of the student body.
How arithmetically dissimilar can that be to different nights, locations, cliques in a members’ club?
Not different enough to draw any conclusions purely on the basis that two people has an institution in common.
then top that off with the 'coincidence' that Dan has inside info on JK work. Then top that with the fact that neither Dan nor JK ever denied knowing each other.
That’s a separate issue. It has been said that JK knows DW and/or has mutual friends. It’s also been said that MM knows OS and/or has mutual friends. There have been explanations of both alleged links offered in the media and online. In both cases, work issues lining up appear to make those alleged links plausible.
Can’t see a rational basis for claiming certainly about either situation, nor for thinking one situation is significantly different from the other.
You have to be really quite partisan to say otherwise.