No, they don't get included as they are not part of the expansions, they are generated by the questlines. Although they can certainly generate a Battleground Battlemaster that is in some cases a lot worse than a 7/7
No. Cards that summon random things can only summon cards that are in the collection. For instance, if a card says: Summon a 4-cost mana minion, this can summon Kargath Bladefist but you can't summon Kargath Prime with a card that summons 8-cost mana minions.