.Show me where it says that every single one of the flying six are vet level...ill wait.
Easily just look at the spoilers, Ulti alone perform already better feat then Daifuku with putting Luffy so much in trouble where he need to use G4, Oda just cut of the fight before it really began to happy. Featwise she stands right now above, portrayalwise they are equal, so stop with your headcanon.
by that same logic nami should have stood NO CHANCE vs Kaulifa even though she was a member of cp9 just .like lucci.
Yet with a far large powergap, Lucci would complete destroy Kalifa, the other top two too.
Since that how much Robin and Nami improve? Did they learn haki? Get their physical and other states improve? Since when they really face strong characters after the timeskip? The last one who Usopp face was Trebol where Usopp get stomped, Robin play the babysitter for Rebecca when Kyros defeat Diamante. When Brook need the help of Sanji while facing just Sheephead.
perospero has a bounty of 700,000. none of the supernova(bar luffy) have a bounty that high, you underestimate him.
No I don´t Perospero is a monster, but also the flyers too, you simple ignore the current feats of Ulti, she is with Drake in same ballpark, what have Nami and Robin proof to beeing in same Ballpark, do they magically beat now xDrake lvl characters?
Stop with this headcanon and nonsense, their is no point at this rate to believe a 1on1 with Nami/Robin against someone as Ulti, at best in teambattles where they get the supporter role.
In the end people like you crying out because the mid-low strawhats didn´t do the thing which you expect for them, it already happen in the last arcs and it don´t change most like in this arc. You going to disappointed you again in the end.