If Rhule somehow only won 6 games you have to seriously consider firing him.
The 2nd Year Effect is very powerful. Even in dumpster fire situations, such a Rhule taking over Baylor, Snyder's first run at Kansas State, or Leipold at Kansas, when it's the right guy you see a big bump (rarely not until year 3). Respectively that is +6, +4, +4 wins over the previous year.
Not only do you see these bumps, but Year 2 is often the largest year to year bump a coach will see at that institution. So if Rhule's big bump is just to go from 5 wins with a good or better chance in 5 others in 2023 to 6 wins in 2024, then that spells terrible news for his prospects of turning this thing around.