MCD Dante would give Mys Dante the biggest dad lecture of all time. Berate his whole personality and make sure Mys Dante is more respectful of women. (I am so sorry for what happened to you Dante you deserved better than Mys)
MCD Vylad would probably be a bit aprehensive at first. Cause Mys Vylad is very chill and happy while MCD Vylad very much isn't half the time. I think they could get along once MCD Vylad adjusts to Mys Vylad and his enthusiasm.
Mcd Laurance... this one might be kinda tricky? Cause it depends on where in the timeline we are with Laur. If its before he becomes a Shadow Knight, I could see these two getting along swimmingly. After he becomes a Shadow Knight? I could see directly after still being a little okay but honestly, the further in canon we get to s3, I couldn't see them really getting along. Mostly because MCD Laurance has gone through so much trauma he becomes difficult to hang around. At least that's what I saw.