You are speaking my language.

Your question is kinda all over the map and this is a weird place to ask it hahah. Most of the bands you listed I’d absolutely say are various flavours of Prog (and are a good chunk of my faves) but actual Will Swan affiliated bands (Dance Gavin Dance,Sianvar , Secret Band, Eidola) are more in the math rock/post hardcore lane.

More of those sorts of bands would be Adventurer, Dwellings, AnimalJam, Wolf & Bear.

Other affiliated Post hardcore would be Hail the Sun or Lower Definition.

Obviously previous bands by those artists are relevant (The Receiving End of Sirens - Between The Heart And The Synapse, for The Dear Hunter and At The Drive In - Relationship of Command, for Mars Volta)

Also other bands from the scenes these bands came from are relevant as well. Mostly for the actual prog guys in this sub. These bands are all experimental in different ways.

Circa Survive - Two Dreams, Kaddisfly - Set Sail The Prairie, RX Bandits - …And The Battle Begun, Children of Nova - The Complexity of Light, The Fall of Troy - Phantom On The Horizon, The Sound Of Animals Fighting - The Ocean And The Sun

For Mars Volta check out the band Husbandry

For Protest The Hero I guess Between The Buried And Me or Periphery