Morris does not believe this is a problem, as at least one of Jesus' promises was made before a general audience. That the priests so firmly remember the pledge is in distinct contrast to the disciples, who fled and are not mentioned as remembering it.
Morris does not view this as an issue, as he thinks that at least one of Jesus' promises was made publicly, which is in stark contrast to the priests who have a distinct memory of it, whereas the disciples fled without being mentioned as recalling it.