It's a Katatonia album and to end the album, I want Jonas to be the last voice I hear. Plus, if you are going to take away vocals from the main singer (and become the voice that the album closes out with) then you had better be just as good as (if not better) than the original vocalist and unfortunately Krister is not even close to Jonas's level. He doesn't have a "horrible" voice or anything, but we are forced to trade in a great, beautiful voice in exchange for just an "okay" voice for the second half of "Departer" and for me at least, that really sours my enjoyment of the full song because I know what I am missing from the second half in comparison with the superb first half. The very first time I got to "Departer" on the album, I had major chills once the chorus kicked in and I was ready to declare it my top favorite song off the album, if not my top favorite Katatonia song overall. However then the "new guy" comes in and I am sure the look on my face at that moment was one of confusion, disgust and disappointment.
It would have been more tolerable if Jonas could have at least sang with Krister in the final chorus, or did a final chorus by himself or even if Krister would have sang the first verse/chorus and Jonas took over for the second. But it's like Jonas just walked out of the recording studio halfway through and when he does, I prefer to have the song end there. I know it's two seperate brothers singing, but after Jonas sings his chilling lines, the new vocals stick out like a sore thumb once Krister steps in. Instead of the song ending with a "wow!", it ends with an "eh...".