There's a pretty healthy-sized thread on Starks. Another on Starks-Grant. And I'm sure if I looked, another on Starks-Grant-Green.
Here's my take on Starks
My link
You said at the end.....
What these highlights didn’t show was Starks in pass protection. He will need to continue developing his skills. I think his greatest area of focus as a pass protector will be processing defensive looks and reacting accordingly.
Starks middle name is "Matador", because that is his general pass blocking style. In the SB he completly wiffed on pass blocking at least twice. Grant is no Brandon Jackson on the blitz pick up, but he usally gets at least a hand on the blitzer.
That's my analysis. If Grant is healthy, he will be the starter till Matador figures out how to stick the blitzer rather than just saying "Ole"