Yes, it would be helpful to see a full length picture of that side of the stave.
I bet that crack goes farther across than you think. I don't trust superglue for those kinds of drying checks. With the grain? Yes, sometimes, but not a check that is in essence a delamination of growth rings.
If you have enough thickness, another potential option might be, to drawknife down to the crack, chase that ring end to end, then back the bow with sinew.