Joseph has to get into shape. Phillips looks average to me. He plays high which for a NT is not a good thing, which is why he calls himself a 3T - and that is what he played yesterday.
I watched Mazi closely yesterday and I thought he looked okay. Not great, but much improved over last year. I think this is what we wanted to see - improvement. He and Joseph may make a pretty good NT rotation. Osa had a lot of plays yesterday too. I think they need someone to give him a rest. Phillips could be that guy, especially on running downs.
By the way, it was a small sample size, but I thought Joseph showed some good strength and push inside. I think he will be as good as if not better than Hankins in time.