I would be interested to hear from John and Chris about whether these cracks are new. We have seen this situation in Sedona before, where the expansion of the bolt sleeve has fractured the rock, at times actually flaking the entire bolt off the rock surface (Tarantula Tower 1st pitch). Just a heads-up that possibly these bolts should be evaluated since a failure would surely be a catastrophe.

Glue-in's should be considered as a replacement. You're right about the hairline cracks as being a big concern.