https://snowbrains.com/the-ultimate-colorado-season-pass-buyers-guide/ This is a good guide for passes to look at when skiing Colorado.
Good summary and without looking too much at the detail it looks like there are some weird anomalies. You can buy an Ikon adult pass for $949 which gives you unlimited access to Steamboat but to buy a Steamboat season pass it costs $1299, why would that be surely they need to be at least the same, who would buy the steamboat pass? I didn't check other resorts on the Ikon pass but how can the resort not match the Ikon pass price at the very least?
Yeah it's a bit misleading about Steamboat. There is no separate Steamboat pass for 19/20, and there wasn't at the start of last season either. I think what happened is that once the Ikon pass ceased being sold for the current season, Steamboat released its own (more expensive) season pass for the rest of the season.