I have my doubts about those billets, too many checks, hope you can prove me wrong.
Those billets remind me of the 4 flawless, knot free arrow straight staves I sealed with wood glue and put in an outside storage building during on particularly hot summer 15 years ago. When I checked on them a month later they looked about like your billets.
I read Dean's book"Hunting the Osage Bow", switched to shellac as a sealer and never had a problem with stave checking again.