The thing that stuck out for me is that you dont yell at the newbie for not testing their code!!!

Hopefully your colleague will fix this bad bad bad habit.

It looks like they are developing a person who can be the backup and or take over this ONE program. In anticipation of your retirement or vesting? EDS rarely let people vest.

They could be looking at you to work on a new project, no? But please, tighten up on the testing.