A Stomacal relationship

Hello everyone!! first at all, i'm sorry if this has been already discussed here, i'm new to this band and since I found them i noticed some things in common between the lead singer Jesse Rutherford and Nirvana's lead singer Kurt Cobain..
i'm not talking about the RIP 2 my youth video (the obvious similitude with Cobain) the thing I noticed is that Jesse talks about stomach ache (he refers to the stomach as tummy) in two songs:

Afraid:
"Make that money, fake that bunny, ache my tummy"
Wiped Out:
"Acting all funny because of the money
It's making my tummy upset"

And if you are a fan of Nirvana, you probably know that Kurt was struggling with some serious stomach problems.

what do you think guys?