Steel is dominant, so red, torts or any non extension can't hide it. Since it is dominant, it is shown with a capital E (so Es or ES: technically the s would be super-scripted, so I write it with a small s because imo it looks more like that.)
Agoutis most often show steel when it's EsE. If the steel is EsEs they almost never show it (this case called supersteel), and if its Ese or Esej they sometimes show steeling, and sometimes not (this case called hidden steels). So agouti can hide steel, or rather, steel is one of the few things that can hide agouti. Selfs always hide steel, it can't express on self; and on otters, you only see the ticking in the areas that would be fawn or white on the otter coat.