Garret elevated Murray when he elevated Murray. In other words, he signed off on drafting the guy, developed him despite his injury and the shortened camp, and then elevated him to starter when Murray demonstrated that he deserved the job. That's incontrovertible. You can try to make the case that the opposite happened, but it's silly and not worth debating.
Not sure if this was meant to be a joke or is just an example of how thoroughly you're agenda is affecting your ability to reason, but, either way, it borders on 'sad.' Costa was not demoted to third string.
Just because I think your take on this issue is really, really bad, it doesn't make Costa 'my boy.' Especially when I'm on record to the contrary in this same thread. I'm not sure what point this quote was supposed to make, though, other than to confirm what everybody already knows: that we signed Bernardeau to play OG and to compete and backup at OC. That's just smart.
What would not be smart would be to sign a player who's a street free agent, who was not deemed worthy of trying to retain in the offseason, whom no other team in the league was willing to sign on to their expanded 90-man roster, who missed all of OTAs, the beginning of training came, and all of the instruction to-date from our new OL coach, and to elevate him ahead of all of the players we kept in his place in order to make him a starter to fill the hole you created in the middle of training camp by replacing our other starter with another career backup who would also be playing out of position.