One thing I do for situations like this is ask for everyone who wants to try to make a roll, then I look at the group successes and failures and adjudicate like that.
So if 2 players notice the footprints and 2 do not, I might say something like “you think you saw something on the ground, but the wizard walked on it before you got a good look”, or “as a group you are pretty sure the inscription is about opening the door, but you can’t agree on what the runes actually mean”
Basically, if the players want all to try something without designated a leader (and the others assisting), they get a group answer based on how well they, as a group, did.