77.6 pass block grade is very strong. That would be the 11th highest grade for an NFL guard, slightly behind megastud Quenton Nelson. I don't agree with everything PFF does but their OL grades are very accurate. It's ok to admit when you're wrong.
Donaldson was Miami's highest graded OL last year in pass protection - 77.6 grade. Clark and Traore are 55.3 and 54.3 respectively.
Healthy Donaldson would be a huge boost.
https://www.pff.com/news/college-football-ranking-all-127-fbs-offensive-lines-through-cfb-week-13