Mick Ralphs was dressed in white, and when a white spotlight illuminated him during a solo, I recall thinking that it was like being visited by a musical angel.

And when I saw Mott, Mick had left yo start Bad Company.
I was a huge Mott fan, and I regretted not seeing both lineups.

I didn't see The Moody Blues until shortly after Mike Pinder's departure, and he'd been replaced by Patrick Moraz.

Oddly enough, I saw Yes with Moraz before seeing them with Rick Wakeman.

Bad Co. really stood out to me as being unusually polished and professional in an era that featured a lot of drunk, drugged, and exhausted musicians.

Sounds good to me!

The other linep change was Blue Weaver instead of Verden Allen. Had I gone to "The Mott" or "Dudes" tour I would have seen to the original lineup, too.
Here's the not-so-funny story about that show.
The opening act was supposed to be Queen, but Brian May contracted Hep A and they had to cancel.
The replacement was Kansas. They were very good, but not that crowd's cup of tea.
Nothing hostile, just indifference.
After about 4 songs of that Kerry Livgren comes to the mic & says "Maybe you'd like us if we wore our glitter underwear."
Then, the crowd got hostile. It was really bad after that.

Insulting an audience won't get you far. Unless you're Steve Miller. He got snotty at an outdoor show at Mile-Hi Stadium right off the bat, saying, "everybody expects me to do this, so I'll get it over with now"... (plays with the guitar behind his head for 15-20 seconds)... "There, how about that!?" (Much of the crowd roars.)

Here's a fun quote from Tommy Bolin, preparing to perform at that same concert, also opening for Peter Frampton... as Frisbees arc about the stage..." It's fuckin' hard enough to fuckin' tune without fuckin' Frisbees bein' fuckin' thrown at ya." "No, it's cool, it's cool"... (a Frisbee narrowly misses him) "FUCK YOU!"

We've had some good times, Professor.

Coincidentally, it was Kansas who opened for Bad Co. when I saw them.