I think Allen and Boom get first shot because Mcvay tends to be a loyal sumbitch. By that I mean he feels more comfortable with players in the system longer that have been reliable starters for us, especially in big games.
Allen was our starting center when we won a Super Bowl and Boom has played well in pass pro in several big games including the NFC divisional game vs Tampa and prior year playoff games.
Noteboom struggled as a LG but he really is solid in pass pro at LT, thus the contract he was given.
I am sure everything will get hashed out in preseason and as the season unfolds but Mcvay is no Bill Parcells or Jimmy Johnson who yanks players after a bad snap or to light a fire under them.
I think Bruss gets a legit shot because he was a high draft choice and had a great college career that they are trusting will translate. One bad preseason game won’t put him in the doghouse but he does need to show well.