Well 73 is obviously better than 63, not sure there were many great guards in the NFL last year. Even Quenton Nelson allowed 23 total pressures — two sacks, four hits and 17 hurries.
2017 was a much better year for guards as a whole. Zach Martin only gave up 11 pressures all year. Decastro wasn't far behind. Martin had an overall PFF grade of 92.2 and Decastro had a 91.7.
I don't know if it was a trend, but it did seem like teams were attacking A gap far more last year whether that was blitzing LB's up the middle or running more 'nascar' type packages on 3rd down.