Question about +stat buffs on familiars

Its by summon ranks, the higher the rank the more it can give. But then that means theres like 3 variations, (small, medium, large). I'm kind of lazy to look into it too much but a rank 1 and rank 2 large healing is clearly different. Red wyvern is about 15% hp, and Mutant snail is about 25% hp, tested it myself. Problem is it screws up when theres potion lock though.

Yeah I heard about that potion lock. But yeah, I think that answers my question? Next would be what are the exact values, I didn't see those in the familiar data, at least not last I checked.

And I'm also interested if those special rare-unique versions of mobs with common familiar cards drop in our version. I would really like that rank 2 Zombie Mushroom/Star Pixie, for the large all stats to party, or the rank 3 Coco. I don't see them in the card droplist, but I have seen them in FM from the booster packs.