>>535147515
I thought it'd become more of a plot point that Ralsei was trying to keep Kris feeling important/unique. As far as I remember, it doesn't come up a single time in 3/4. Ralsei gets antsy about switching Kris's controller, but it's more because Ralsei felt uncomfortable leading, not due to taking anything from Kris.
Whereas in chapter 2, it's pretty clear during the Sweet Capn Cakes fight that Ralsei invented a fiction where only Kris can Act, Susie broke that charade, and Ralsei apologizes to Kris about it.
We also see that Kris googled "how to use magic" which might be because they don't have a magic menu in the dark world, depending on when the internet actually went out in the story. If you fuck around in the tutorial when Ralsei asks you to use his magic menu, he gets uncomfortable and asks pic related. So in 1/2 Kris's lack of magical talent is in the forefront of Ralsei's mind.
Even then, though, I guess there was the time when Susie asks if she can learn Ralsei's healing and he says something like "of course, healing magic is easy." Despite Kris being there to hear that and feel bad. So IDK, maybe he's just not very good at balancing all this shit with the weight of the world on his shoulders.