Ganon can very much amp his physical might via magic, and Link tanks and then A>B>C, basic stuff.
Not withstanding Link has tanked magical attacks from Ganon full stop before and thus, shit still goes A>B>C.
But even then, it's not like there isn't some pretty wild physical exclusive feats, like Demise's fissure or Guardian shit that's at least like 7-A, that (an extremely weak, half baked, fodder iteration of) Ganon physically scales to, there's also Ganon literally busting an island around the same time he does his 6-C feat.
Or ****, the Giant's literally halting some tier 6 shit with their bare hands, or Malladus' country bust (if not 6-A bust) statement being from what we can tell either physical, fire, or meteor based, and Link scales to all said methods.
If the issue is "no non magic feat comes close", it's not entirely true.
Just because some magic shit is the crux of the scaling doesn't mean that's all there is to it.
And the worst part of this is, Link scales durability wise to literally
all of this. So either way.
And if the issue is something about magical power being used for everything or whatever, Link proves that pretty decisively imo, given all his stuff, including even his spin attack in some games, all draw from the same power source. Link's Elemental Arrows and Mastered Spin Attack (a physical attack obviously) both draw from the same magic, some takes more, some take less, the stronger ones take more magic, the weaker ones take less, it's about as straightforward as you can get.
Edit: Oh yeah, even in regards to sustainability feats in Zelda, they're done via the user's
magical strength. Which of course, scales to their actual magical attacks like magic blasts and shit, that Link tanks. And it's not even vague, for example,
Vaati. Stated outright.