Thanks for the solid advice Badger. Sometimes l need to knock myself on the head to release the common sense. I'll definitely seal the whole stave in future.
Pat, they checked along the back in about two days in my mildly heated shop. I'm not overly concerned though, I think l'll just discard them as they were from a log that l split that was stored outdoors for about a year and showed signs of rot in the sapwood. These were just a few staves that l kept as they were deeper in the log, closer to the centre. On this topic, l'm looking at another white Oak log that seems ideal for staves and was felled between 6-8 weeks ago. l'ts been sitting on the ground since. l took to heart the advice that the tree should be felled, split and the staves sealed and put in the dry immediately, but is two months of outdoor exposure acceptible (Southern Ontario).
Dave