You mentioned before about a possible relationship between the two skin lines as factions in a space opera but it wasn't concrete. Could you settle a debate and confirm whether there is, in fact, a link?
Also, does Eternum fit into this universe?
When working on DN Darius there was talk of combining the above themes into a space opera [steel legion, dreadnova, eternum], but it was never really hashed out so not officially no.
Honestly they rarely connect skin universes unless these connections are rather obvious.
I mean people speculate that Project,Program,Battlecast or mecha are related,but none of them are. Same goes for dark star and star guardian.
I think Steel Legion and Dreadnova more accurately are Grimdark thenes, not space opera.
A bit off topic but...
I really want Dread Nova Wukong and Stell Legion Jarvan.
No, the Steel Legion skins and Darius's Bioforge skin were intended to be opposing each other.
http://www.surrenderat20.net/2013/02/ironstylus-shares-his-thoughts-on-steel.html
