I don't want to discredit Quinn but Mayhew brought guys in as well.. All GM's do. It depends on if it works out or not.. It probably is no big deal if he fails but if he's a guard here then I don't understand it even more.
Mayhew didn't really bring in guys at tackle that high of picks at RT. Undrafted (Waddle and Lucas) and cheap free agents. (Hilliard and Ola) Took Reiff and Jason Fox though in drafts. Inherited Backus and Gosder in Round 1. Backus had just signed a long term deal in 2007 to big money with Millen and played through 2011 season on that. Signed Backus to a new deal before 2012 season too. Reiff panned out but the Vikings over paid him.
resigned Raiola and Peterman long term in 2009. Brought in Sims for 5th round pick. Drafted Laken in 2015. Drafted Warford in 2013.
Mayhew did a lot on the line too except RT.