Originally Posted by
MisterWillow
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We don't even know how the XP and level system will work during solo play, so... yeah.
My best guess is that, if you can sign in to multiple accounts on console (unsure if you can on Xbox1), each player would retain their XP, and if not, then the second player would be a duplicate or ghost account (i.e. MisterWillow1 in my case), that would have all XP wiped once the second player leaves (since that account only exists for that duration of playtime). In terms of a duplicate account's level at the time of signing in, though, and using Helldivers as an example, I presume they would have everything that the primary payer has unlocked.