Pass level has zero influence on the quality on Season chest drops. A player with the Free Pass gets the same chest drop rates at all chest rarity types as a player with a Platinum Pass.
That’s how the system is designed. Season Pass holders get access to additional quantities of Season currencies than non-pass holders in exchange for extra effort. How a player spends that currency makes all the difference in the world regarding what rewards are obtained in a given Season.
And there’s the problem right there.
You bought ALL the skins. That’s 5 * 400 Season Currency = 2000 total Season Currency spent.
Instead, you could have invested in Season relics in the Rewards shop.
Assuming you could supply the 6 needed Glyphs for both Legendary and Mythic ascensions, a Mythic of Choice (outside of the featured Legendary thing) costs:
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150 Gems for the Firecap Relic (0 Gems if you brute force Eveline until she rolls one, which can take multiple days to happen) for Rare.
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75 Anthrite * 2 Dire Tusk Relics (at 1 per week), for a total of 150 Anthrite needed for Epic.
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150 Anthrite * 3 Red Gear Relics (at 1 per week) = 450 additional Anthrite needed (+2 Glyphs) for Legendary. [600 Anthrite Total]
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350 Anthrite * 4 Ruby Chalice Relics (at 1 per week) = 1400 additional Anthrite needed (+4 Glyphs) for Mythic. [2000 Anthrite Total]
In the end, you bought 5 skins for the 2000 Anthrite instead of the parts (outside of Glyphs) for a Mythic thing from the Season.
As it takes 4 weeks to obtain all of the relics needed for Mythic, a player could obtain the parts for 3 Legendary things (assuming the shop resets for a partial 9th week, less needed Glyphs) or 2 Mythic things (again minus Glyphs) in a 8 week Season, presuming that can farm and/or buy sufficient Anthrite to buy relics from the Rewards shop by weekly reset to avoid missing a needed Mythic relic. No touching any Cache is needed at all to achieve this.
Of course, investing that much Season currency into relics places a significant hamper on the player’s ability to chase the Season featured Legendary thing. That’s a decision each player has to make on their own. The system, as currently designed, is not favorable towards players chasing everything in a given Season.
IMO, the season featured Legendary thing is bait and a trap for players to fall into. Unless you are really going to use the featured Legendary thing seriously on your main character, don’t go chasing it. You’ll get much better results picking and choosing specific Season things to pursue and focusing strictly on those things only. After obtaining and ascending the specific things you want from a Season, then and only then go after the Season featured Legendary thing or skins with any leftover Season currency you have at that point.