I think it's fine to have experienced medics
Having decent meta calls instead of whatever a fresh meat maincaller comes up with is a more accurate representation of competitive
And if you restrict the buddies completely, a couple teams will have a discord screenshare maincaller. Has happened before
logs aren't an accurate representation of experience.
I consider it on par with comparing MGE elo or TF2 hours played
I feel it'd be weird to have ppl who have interest in comp (playing centers for example), but not give them an opportunity. Perhaps they never found ppl they were comfortable playing with on a team, or they couldn't invest the time in the past, or they didn't know where to start