That wasn't just because of the centre halves though, that's the point. Burnley play a defensive system where they don't leave gaps and everybody is well drilled in the plan because they've been doing it every week for the last 5/6 years. Our centre halves were changing partners, formations, managers etc every 5 minutes and had no protection from their midfield, it's just impossible to compare that way. As i've already said (and should be obvious to anyone who watched Burnley as much as you apparently did) them being solid defensively and toothless in attack isn't a coincidence, it's directly linked to how they play and has been their MO for years. Worth noting that even then, Tarkowski has been a mainstay in defence that has conceded more than that 'crazy' 66 in a season in the past.