Oh, no; here we go again. :-(
I wouldn't be too concerned about this decommitment in a vacuum - and I'd guess it's more UNH's decision than anything else. Bahn has been better than I expected, but to me, he still looks like a John Furgele type at the DI level. Hopefully, UNH has eyes on a more impactful defenseman for one of the next two seasons...
Where this could become a problem is how the returning D-corp shakes out. Right now things are more than adequate on the blueline for 2019-20...
Wyse - Gildon
MacKinnon - Maass
Verrier - Erikkson
Hickey - McElhaney
Things get shaky if Gildon leaves, as expected, and fall apart quickly if Wyse also departs. The other wildcard is McElhaney - who has barely played this season following a significant injury. If he comes to Durham on schedule, he'll do so having essentially missed his entire USHL career...
Does Bahn's decommitment reflect on UNH's expectations for Gildon, Wyse or both? If so, maybe it's the best news they could have received? If both return defense will be a massive strength next year and UNH has a chance to be very good. However, if Gildon does leave UNH really could use another defenseman (and if Wyse goes, two). I do think they can find better blueliners than Bahn; even this late in the process...
Perhaps they already have - on one of their recent trips (Montreal) - and this is the fallout...
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If not, one possibility might be Spencer Cox. Cox committed to Miami at a young age, has since re-opened his recruitment, excelled at USA festivals and currently plays for Culver Military Academy (where he was a teammate of Jackson Pierson a year ago)...
https://www.eliteprospects.com/player/295619/spencer-cox
Another possibility might be Trevor Zins, who is having a high-scoring season with Trail (BCHL) - where he is a teammate of incoming forward Chase Stevenson. Zins appears to no longer be committed to UMass-Lowell...
https://bchl.ca/stats/player/5119/36/trevor-zins
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Speaking of connections to UNH's current roster - I had previously mentioned former Denver forward Brendan Budy (a teammate and linemate of Angus Crookshank in Langley). Budy is up to 5-12--17 in 16 games since heading to the USHL. He should absolutely be on UNH's radar at this point...