Keep in mind that Folinic's situation was right when Wolumonde underwent a crisis and Mudrock realizes she basically stirred a riot for nothing after finding out that Atro's killers killed themselves, so she wouldn't have much motive to join a company she's never heard of and would rather get out of dodge quick.

For Logos, he rescued her, solo, from some Leith guys looking for magic target practice and with Mudrock's squad on their last feet, she's more than inclined to join. It helps that Logos is a cool and swell guy, in contrast to Folinic going harmacist trying to find Atro's killers.