Sounds about right on the two major theories or combination.
To me, those are important, but putting the best players at their best positions should always be the #1 guideline. I won't say rule, but it should be the top priority.
On the Devers thing, they could have tole him 2-3-4 winters ago, "Hey, can you grab a 1Bman's mitt and workout this winter at 1B, in case we need you there. Expect to work out there this ST'ing a little bit." I don't see that as being a difficult task for a manager to do, and even if it is a bit uncomfortable, it's part of your job functions/description.
The Story-Bogey choice was more complex. Story was coming off a major injury and was building up arm strength. They may have also known Bogey had just one year left and they transition could wait a year. Story was also "okay" with the move to 2B. I guess Cora is fine talking to new players, despite them being veterans.