Since everyone keeps bringing this up as "the only time Kirk has had power", from April 2022 - June 2022 Kirk had 246 PAs with a 166 wRC+, I don't know how to get the WAR values for that, but presumably it would've been much better on a WAR/game basis given that he also provides very good defense behind the plate. Unfortunately for Kirk, he was actually healthy all year so his numbers understandably took a tumble (regressed) the rest of the season. But if he got injured for the year on July 1st then Kirk would look incredible on a WAR/game basis. This is why this argument about Jansen doesn't sit too well for me, yeah he was good, of course, but he never sustained the success because he would get injured for long stretches at any point where his numbers could've regressed.
Jansen's numbers btw did not come over "nearly two full seasons", but rather barely one full one.