Good points, but Im would add one big caveat to this and that is (to your entire well thought out post): *
*at this point in time
One of my things is flexibility and not making decisions before you have to. We simply dont know how Casas will look coming off that weird injury, how Devers shoulder will behave, if Campbell complicates by forcing his way into the infield, how far we go next year. What if we get to the ALCS and lose and we prove to be close despite carrying Casas all year who never fully re-found his groove (not saying this is anything more than one of many possibilities).
Can it happen? Short answer is yes. Will it happen? Short answer is maybe. Should it happen? short answer is things will change between now and the time when its time to make this decision, and any opinions we have on it now will be dated by then