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Did all of that (moving parts around and replacing parts). I described it in my original posting

Couldn't tell the difference.

Changed the original plugs out at 75,000 miles as recommended by the manufacturer. Problem did not begin to occur until the car had approximately 90,000 miles. And still had the CEL nearly immediately after replacing the one for the no. 1 cylinder when the problem began. And, while not...

I used the NGK part number that you cited. That is number that is actually stamped on the factory plugs. A did use a Mazda coil, both times.

I installed the Ruthenium plugs on a 2015 with the 2.5L several weeks ago. I did so without hesitation, as I believe that NGK, as the maker of the factory Iridium's, wouldn't be likely to engineer a plug that didn't meet the needs of the car. Plus, they are actually now slightly less expensive...

This can be borrowed for free at many auto parts stores.

2015 CX-5 2.5L Over the past 6 months the CEL has come on multiple times and the code is always P0301 - Cylinder No. 1 misfire. No detected driveability issues After the first time, I just went ahead and replaced the no. 1 ignition coil ( the plugs were all replaced just over 20,000 miles...

Rock Auto sells the INA part for under $40.

Rock Auto sells the INA tensioner for less than $40.