re: Is anyone else concerned about the lack of 5*?

Time will tell whether those 5 stars are elite. I think Bryce young has a good chance of being on that level but there are only 1-2 derrick brown/chase young type players each class. I wouldn't put all 5 stars in that same category.
I agree with your premise, though. We do need some elite players at those positions. Hopefully Leigh and Maason do that for us.