I had a close look at those "rings" and they are not rings but aberrant markings in the form of short stripes. They don't go around the tentacle and there are only 2 or 3 tentacles that have this. Also there is no ring on the base where the tentacles go into the oral disk.
I also can't see how size would be a measure as there are most certainly magnificas which are at some stage in their live smaller than 6 inch in diameter. I doubt they just materialize fully grown out of nowhere.
Also, it would be totally new to me that malus have green tips. Purple, yes, green, no.
Column and verrucae placement also match a magnifica.
Finally, if a guy who studied this and made it his living (and saw it in person) says this is a magnifica, then I believe it's a magnifica.