You're both right that it's weird to have a standout. I'm not calling you liars, but I am both curious and skeptical about there being no other stat requirements...
It's cool.
Let me specify. There are stat requirements all over the place in CoC II. However, these stat requirements are singular. It seems our disagreement may have come from the result of a misunderstanding.
If something required the toughness stat to pass the check then even characters that do not have that as a stat could drink Spiced Wine from Garth's to temp Max toughness to go through that check. This is the same for all other stat check.
The problem with the Elosa, is that it requires two simultaneous stat checks. If your build lacks both Cunning and Willpower, then there is no way (outside of changing your stats through training) to get both stats even on a temporary basis.
It gets even more ridiculous, since through the Secutor set, you can temp max out 5 stats out of 6, but there is still no way to max out Willpower and Cunning at the same time if you do not possess 1.
Additionally, most cunning checks are actually cunning personality checks (which you can gain through either high cunning or circlet of clarity). The Elosa ritual is a pure stat check.
This is not to say that I think there shouldn't be any hoops to jump through for Elosa. One suggestion I had as an alternative is that Juice would allow you to complete the ritual. It's a bit out of the way to get, require some out of the box thinking, and it thematically makes sense. Or make the cunning stat check a cunning personality check.