Shouldn't start with anything at all TBH.
No I meant dropping from within NGS itself. We know 15★ PSO2 weapons (at least excepting katanas, bows, jet boots, soaring blades and harmonizers) will be converted to 4★ in NGS. I'm not expecting them to be instantly obsoleted by 7★ or better drops that people will be getting on day 1, let alone ones that have an equipment requirement of 1 like Zax, Basileon and friends that were an obvious catch-up mechanism. No catch-up will be needed at the start of the new game.
They've already written out that the maximum rarity of items will be 4★ on NGS launch.