The assumed average team is lower than you'd think. 15% for a given draw to be SR rarity aside, prior to adding Belobog, there's 7 kamihime weapons, 33 non-kamihime weapons, and 26 eidolon in SR. A new player is assumed to be running story girls, R's, and maybe 1 SR kamihime in the first week. A new player is also assumed to not have the familiarity with the system that'd come from already playing for a week or two.