I think you're reading in some arguments I'm not making.
I didn't say that Portland's high Offensive Rating meant nothing. I pointed out that just as slow pace made Portland's defense look better (by points scored), slow pace made Portland's offense look worse (by points scored). Portland was legitimately a great offensive team back then, but points scored made them look middle of the pack.
I also never said McMillan was a bad defensive coach. I said that Portland's defense was never good under McMillan. That's a very different thing and I even pointed out that a similar issue was at play back then--that the team's best players weren't good defenders. Even if you're a good defensive coach, it's difficult to impossible to build a strong defense when your best players, the ones you count on to play the most minutes, aren't good at defense.
Also, yes, when I said "awful pace," I was referring to ranking. I can see why you read a value judgment into that.