Why ?
It would be like visiting Rapture before playing Bioshock.
I never played Bioshock so don't understand the reference.
But its just another system, one out of 110, which has been described in lore.
Its the same as saying you don't want to see Pyro because of spoilers or Nyx.
Just because it will feature in SQ42 just means you'd get to see it for the first time in SC if it came first.
And let's just back up a bit. Let's say CIG start adding new systems, but SQ42 still isn't released. Then they shouldn't add it? Let's say they start pumping out new systems every month like some backers foolishly believe. It shouldn't be added because "spoilers"? What % of backers do you think would swallow that tripe?
Actually, i'd say the main reason not to add Odin early would be because its nowhere near Stanton.
Pyro makes sense. But the next systems shouldn't be Odin or Nix. They should be Terra (man, that one is going to take CIG years!) and Magnus.
However, if they want to make a beeline for Odin, then yes, Pyro, Nix, then Odin then (LOL) Kellog. Then they get to the border with Vanduul space. They might get that done by 2030 I suppose.