So Septimus is going to be rather public about "Guys, time to organize" and making open efforts in trying to connect the various disjoint groups (though not being public when taking direct action against Malicant). This will include training people--not as much in personal fighting skill, which other people are doing, but in working together in units, both making regular ones and 'this is how you deal with a change in the line-up.'

I rather expect this will appeal to Kaldur'ahm.

Also, he's an imperial prince. He was under a lot of those pressures to be perfect--just as it turned out his ideas of that were rather different from his father's. I expect that could mesh well with Kaldur, maybe help him learn what being himself and living up to it can mean?

(Plus Kaldur's sense of humor will appeal to Septimus enormously.)