Yes he can definitely get better there, and you often see dramatic improvements in players between year one and two, but not so much later on. He is a bit in the middle there.
As far as the OP, we may have seen the peak of Biadasz while Steele may still have some room to improve.
I do agree with wanting a dominant center. Looking back in recent history, when we have had a solid center (Step, Donaldson, Gurode, Fred), the line itself was a strength. We we didn't (Shiver, Costa, etc), the line was a problem.
The jury is still really out on Biadasz but headed into year three for him (basically year two in his case), it's time to step it up a level, or be average.
I very very much could see this one going either way.