It's not up to the assistants to take the lead in situations like that. It's on the head coach 100%. And whether it was worthy of an overturn is beside the point. You have to make it uncomfortable for the officials to make that tough call against you, right from the start. You actually have to have a history of advocating for your team, sometimes no matter the cost, at least at the D-1 level, and certainly above. Your job is to use every possible intangible to help your guys win a game, and MS7 lost it last night by having a wishy-washy reputation that allowed the officiating crew to overlook a very obvious (and dangerous) boarding call that could have seen Ring seriously injured. The rest of it all flowed from that oversight, and the officials knowing Souza would not meaningfully hold them accountable.
Let's face it ... it wasn't a super important game, other than for postseason seeding. But if a head coach has a certain level of respect, an officiating crew will almost feel obligated to "even things up", despite the fact that's a no-no in the public officiating gospel. But that respect simply doesn't exist for Souza, and we see this manifest itself from time to time. And mind you, the current HEA commish is tied to UNH from his prior employment. Joey "Buttons" Bertagna would never come in against one of his league's most respected HC's, and if it was a York or Parker against a roadkill HC like Pooley (PC) or MacDonald (UML) or even Cahoon (UMA), you didn't have to do a lot of analysis to figure out the ending.
Souza exudes an aura that oozes indifference ... so if the officials don't think he's upset or will get upset if there is a tough call to be made, it's path of least resistance.