Mike Buckley was promoted to goalie coach of the Pittsburgh Penguins on June 17th after the 2016-17 goalie coach Mike Bales took the job with Carolina. This came as a pleasant surprise to Buckley. The UNH coaches promptly identified their top candidates to replace Buckley as the volunteer goalie coach of UNH. Given that the candidates have had to consider career changes and the financial implications of committing to an unpaid position, it has taken time to finalize the arrangements.
As of this moment, Drew Commesso has not committed to another school though the speculation on twitter is that BU will be selected. Commesso's longtime goalie coach, Brian Eklund became the volunteer goalie coach for BU in early September, 2016. 14-year-old Commesso enthusiastically committed to UNH in December, 2016 - that is, knowing that Eklund was at BU:
http://unhhockeyblog.blogspot.com/2016/12/14-year-old-goalie-drew-commesso.html
Since he verbally committed to UNH, he has tweeted or retweeted some positive messages about UNH hockey the last being this one from June:
<blockquote class="twitter-tweet" data-lang="en"><p lang="en" dir="ltr">Congratulations Coach <a href="https://twitter.com/hashtag/MikeBuckley?src=hash">#MikeBuckley</a> <a href="https://twitter.com/gdsgoalies">@gdsgoalies</a> <a href="https://t.co/prwn0DjFc8">https://t.co/prwn0DjFc8</a></p>— Mike Lowry (@UNHRecruitsCHC) <a href="https://twitter.com/UNHRecruitsCHC/status/874221473216548865">June 12, 2017</a></blockquote>
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Reading between the lines, it is likely Buckley's decision to relinquish his volunteer goalie coaching position at UNH was a factor in Commesso's decision to withdraw his commitment. If anyone thinks Coach Souza didn't make efforts to allay any concerns of Drew and his family about who would replace Coach Buckley as the UNH goalie coach, then IMO you don't know how Coach Souza does his job.