I wanted at least one of these three for our Bears, but JA is a lot smarter than all of us. Right? Matt Birk may not be ready for the season opener after undergoing knee surgery a few days ago, which means two undrafted rookies, Ryan Bartholomew and Tim Barnes, will be vying for the starting center spot. http://baltimoreguide.com/http:/baltimoreguide.com/yanda-grubbs-not-practicing-815/ OWINGS MILLS — Offensive guards Marshal Yanda (back spasms) and Ben Grubbs (undisclosed) are not practicing Monday. For Yanda, it’s the third consecutive practice he has missed. Undrafted rookie offensive guard Justin Boren is starting at left guard with Grubbs out. He’s still a work in progress. and where is our one UDFA Center? Anyone hear anything?