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I was told it was okay that I missed quite a lot of spots on my minis because I used Army Painter spray which is very easy to overspray so I went light.

Should I try my best to respray over these spots? I'm worried about covering details with too many coats of primer. Or is it okay to just paint over the small bits of grey if the models are already 90% covered in primer?

I read that people use Chaos Black to brush over missed spots. Will this really work as well as sprayed primer? And for white, should I use Ceramite White or White Scar to brush over? Pretty sure people used Skull White back in the day, which is White Scar, but nowadays we have Ceramite White.

When priming it's usually best to do 2-3 light coats anyway, so if you've only done one .. go back and do another light coat.

Using your regular model paints in place of primer just isn't the same (at least not the same as proper primer which adheres to the surface and provides a better painting surface with some "tooth" to it). This isn't quite as much of a problem with plastics as it is with metals though.

The point of primer is essentially to provide a strong anchor for subsequent layers of paint. Really, a thorough dusting is all that should be necessary; 100% opaque coverage isn't required to get any benefits, even if it would be preferable. The reason people fill in gaps with regular paint is to get an even color base for further painting - since the missed spots are usually small and out of the way, the added resilience that primer grants is less of a concern than it would be on the spots that are easy to hit.

If you want absolute coverage with your spray, you'll need to hit them from every angle with multiple, light passes. Keeping as many parts separate as possible allows easier access. Honestly, though, I think you'll be just fine painting them up with almost total coverage. If it really caused catastrophic issues, no one would suggest it.

With spray cans, anything you miss can be touched up with paint, provided that SOME primer got on it.

And for the most part, the outer parts are the most important to prime since they will have the most contact with other things.

If an edge that you constantly are touching when moving the model isn't primed then the paint will quickly chip away. If that steep undercut in the arm pit didn't get a good coat, it won't likely ever matter.

If you primer with an airbrush, these aren't really issues as it's quite easy to get every possible angle done.