In a perfect world I agree with you, would be ideal to have one or both spots filled before this month's summer ball. However, with 3 solid verbal commits for '18 already in tow, I'm not sure the July live period has as much importance this year as it has in others. Not trying to downplay it, but it seems like UM has its targets pretty well identified for this class --- and those targets seem to know they're UM priorities.
Bigger item would be identifying a secondary group to target for '19 --- although that may be a fairly small class for UM. But get the correct assistant coach in the program and he could help clear up the picture for '19.