No role selected = any role. Comfort is the player's own 1–5 rating per position from their signup.
⚠ Standins with a higher MMR than your target are shown with a warning — captains regularly reject higher-MMR standins.
Pick the league you need the standin for: players signed up for its current season are flagged ⚠ likely busy (they may already be on a team there — or even be the player you're replacing). Players from other leagues are usually the safer ask.