Where is Nobutsuna Kamiizumi and Alternis Dim in Chapter 5

In Chapter 5 after getting the party together and getting back onto Grandship a whole bunch of sidequests open up, all of which are re-fighting Eternia's Asterisk Holders.

So far i just beaten Lord DeRosso, the last one i had marked on the map however i haven't re-fought Swordmaster Nobutsuna Kamiizumi, Pirate Capatin Hayreddin Barbarossa and Dark Knight Alternis Dim and thewre are no more side quest markers on the map.

i know i won't be able to fight Barbarossa until i release the Water Crystal so i can land the ship in the water and sail to the fog bank however Kamiizumi was at the Swordbearers' H.Q, Starkfort, however i went there and he wasn't there. considering that in the world Chapter 5 is in

Olivia died in an earthquake months before rather than being killed by Victoria

i thought maybe Kamiizumi was somewhere else so i fought Dr Quda however, just like last time how he fakes his death Kamiizumi turns up while he is plotting and slays him, however there's no subquest marker on Starkfort like there was when Dr Quda was there (so that rules out him only being available after Quda is dead).

So i am wondering, where do i re-fight Swordmaster Nobutsuna Kamiizumi? or is he a storyline boss like what some of the Asterisk Holders were the first time (is so don't spoil it).

I'm also asking the same for Alternis Dim however i got a feeling that he was still alive when what ever happened at the Pillar of Light occurred and proable is a storyline boss like he was in the previous chapter, but i want to double check as not to miss out on a sidequest fight