It's more of a change-of-pace thing than spelling Taylor...it throws off the defense to have to adjust to different running styles.
I am not an expert football strategist by any means, but I will weigh in with my opinion on a few of those points.
1) I didn't see a need for Moore to spell Taylor.
He was running fine, in fact better IMHO, as the game wore on.
I think if the need arises to spell him more, Coach Childress will do so.
4) I didn't notice a lot of extra blitzes, but I could be wrong. I think the front four were doing well with their penetration, MB was just smart enough to get rid of the ball before getting sacked.
5) I agreed with Childress's playcalling on the final drive 100%.
It was more important to burn the clock than to go for a touchdown.
Had we tried to throw a couple in the endzone and had an incomplete pass, the skins would have had a time out left, which would have meant at least one chance throw into the endzone for them.