Team 2

Keeps: The team stays mono-Fusion (Jingran, Lupa, and either Brant or Mortefi are all Fusion), and Lupa's own Basic Attack buff is unaffected either way.

Costs: Brant is tagged Sub DPS/Sustain and "buffs Resonance Skill"; Mortefi is Sub DPS only, with no Sustain role, and "buffs Heavy Attack" instead. Swapping to Mortefi removes the team's only Sustain-tagged member (neither Lupa nor Mortefi carries Sustain), but Mortefi's buff type actually matches Jingran's Heavy-Attack-focused kit better than Brant's Resonance Skill buff does.

Rotation: Jingran's own Shield doesn't depend on this slot either way, since it comes from his own kit while he's attacking, not from Brant or Mortefi. Beyond that, no tested comparison of the two lineups' full rotation exists here yet.

Energy Regen: Not verified on this site.

Requires: No specific sequence or weapon requirement is documented for Mortefi in this slot. He is also the only 4-star option across all three of Jingran's listed teams.

Don't swap if: If you need Brant's Sustain role to survive current content, swapping him for Mortefi leaves this specific lineup (Jingran, Lupa, Mortefi) with no Sustain-tagged member at all.