Well, the game is litterally given for free with any XB1 purchase currently.
I believe those are strictly standalone sales. Most retailers/e-retailers have bundling codes or discount codes for special sales/deals. So, I’m pretty sure we’re seeing standalone XB1 Destiny sales… we would have seen some major movement in XB1 hardware on Amazon if that was the case (your scenario). But we haven’t…
Edit: Damn, GTA V is already becoming a hot item I see. R* power...