Hey maybe we shouldn't close this yet we could uses this thread to discuss and try to guess what their powers are because it has finally been reveal that every mangekyo its different(haven't been said so it's only a guess not a fact) meaning they could all have deffirent powers too.
''Brother running with a torch and not a damn thing you can do about it!''
I doubt the size of design makes a difference. But the different designs might change the effect of MS jutsu. Like all the MS's come with Tsukiyomi and Amaterasu. But Itachi's Tsukiyomi differs in effect from Kakashi's (supposed) Tsukiyomi.