Intentionally disproportionate match ups for promotion series?

Hi fellow leaguers! Based on the body of data currently existing, including but not limited to massive anecdotal evidence, is it statistically more likely to be grouped with trolls in promotional series games? The argument that this makes sense is essentially based on the fact that a promotion is reflective of skills, so promotional games should be harder- and a way to do that is to match players up with offenders and low mmr trolls, people with disciplinary histories, etc.

Has anyone else witnessed this phenomenon, and is it fair to arrange promos in this manner? Please discuss!