I get the theory and I think he'll play so little that it would be difficult to tell. I also think those 5 minutes, spread around our current group would be the same thing.
As to Jack Wilson not hurting you, I hope that is how it plays out but it isn't how it's played out anywhere he has ever played. He had the second worst plus/minus on the entire team in his last year at Idaho (behind a guy who played 6 minutes in 1 game) and the lowest on the entire team the previous season. During his time at Idaho, the exact opposite scenario played out to what I bolded above. The team was way worse with him on the court both seasons. I've actually seen very few people with worse stats and had a worse impact on the court than Jack Wilson (statistically).
As far as Thompson, the team was just kind of worse with him out there. He ranked between JOJ and Taurus Samuels, kind right in there with other bad players (Samuels, Henley, JOJ). All of their numbers are way better than Wilson's. To put that into perspective, Wilson's numbers are way worse than Gaston Diedhiou's. He has a negative win/share.
At the end of the day, it's probably not going to matter. Wilson is more of a waste of a scholarship (Ogele) than someone we will be watching play. For next year, the main thing that matters is getting more guards.