There is, after all, only so much an INT 12 player can do to role play an INT 18 character and if the player’s version of extrovert is to talk to your shoes not their own then a roll for their CHAR 15 character may be in order
100%
For knowledge or simple brain power situations I would as GM often describe the scene or situation to the comprehension of the group average, but then give extra details or clarifications to the player whose character has the more knowledge.
To the Group: “You see a guard who looks like XXX”
To the Player with the knowledge: “YOU notice that his emblem on his shield is from before the time period in question”
etc.
Or when the wizard sets a snare to catch a rabbit.
To the wizard: “You set what seems to be a pretty sound trap”
To the hunter character: “You can see a number of flaws in the wizards snare”
etc.
I then rely on the players to play as their character would given what their characters know.
