Agree on Aboushi, hope he gets his shot against the 49'ers. Shelton played LG last year in a limited role while filling in for Edwards and did quite well imo. Chandler Brewer was a back-up to Whitworth a couple years ago at LT, also had very limited snaps, but appeared to hold his own, he can also back-up both OG positions if necessary. While Skura has mostly played Center, he also has experience at both OG positions. I don't know this as fact, but I assume Arcuri gets both RT and LT snaps during practice.
Even with all this, I suspect that McVay isn't done with Evans yet. jmo.