Exactly. More generally, this is what code reviews are for. On top of the personal issues that might be occurring there, it looks like that team doesn't do code

Exactly. More generally, this is what code reviews are for. On top of the personal issues that might be occurring there, it looks like that team doesn't do code reviews. Code reviews are not just to make sure the code that goes in is sound, they also help getting multiple team members familiar with the entire code base.