Isn’t something wrong with the fact that universe 7 has 2 supreme kaioshins?

I can understand the fact that Beerus locked up the old kai in Z sword because that life string between them and bla bla, but that makes me ask 2 questions about it, one is: how the grand priest and/or grand Zeno took that? Not the fact that he locked up old kai but the fact that now are 2 supreme kai, and second: how does that affect both gods of creation and destruction? Of what supreme kai, Beerus’ life are tied to? Older or Shin? And what if for some reason Beerus die? Which supreme kai would die?

I can understand the fact that Beerus locked up the old kai in Z sword because that life string between them and bla bla, but that makes me ask 2 questions about it, one is: how the grand priest and/or grand Zeno took that? Not the fact that he locked up old kai but the fact that now are 2 supreme kai, and second: how does that affect both gods of creation and destruction? Of what supreme kai, Beerus’ life are tied to? Older or Shin? And what if for some reason Beerus die? Which supreme kai would die?