Ahh my friend, great point.

I saw Birk get pushed around a little last year. I think the bulk and strength will make him better against the interior defensive linemen.
Even if he is a little slower, I think the trade off will be positive.
I am sure that is why he beefed up a bit. (whole lot really).
Again, hope it isn't at the expense of speed.

He is smart.
I am sure he knew what he was doing.