The signee that is the most likely to be drafted high enough to consider signing is Dexter Jordan. There are several other HS signees that might be drafted similar to Cantrelle, but are likely not high enough to warrant decent signing bonuses.
The JC arms have not pitched well from the last stats I recently looked at, although that doesn't mean any of them won't be drafted. But it is highly unlikely that any of them get drafted in the top 12 rounds according to the recent college draft reports.
I don't know anything about the recent JC commits, so I will wait to hear those announced. But overall, there on a few early signees to be concerned about with the MLB Draft.