Dumar being around had always been kind of strange, to begin with so his departure is fine with me. Either give him the reign (some kind of consultant for Monte McNair) or just let him go, it's that simple since no one outside of the organization knows exactly what his capacity is anyway.
And I understand why people are so against Vivek's involvement but that's his company, he definitely can't just take one of this, albeit trusted, employee's word alone to hire such a crucial position. Come on now...
As long as it was not against our GM's decision, Vivek surely has the right to join in on the interview process.