All 2nd-init recovery hijacks kernel at early boot & so, they've similar hijack methods but probably diffrent binaries or hijack scripts. There're many diffrences in the operation that you could easily notice by reading the Q&A section. MultiSystem is designed to be independet on device nor the OS version. I've tester's success on VZW S4 & ATT Note 3 for both LP & KK.
As for ramdisk hijack, this may be a long wait, since I need to deliver the main functions to almost all devices before adding time-consuming features.
So, if I'm on a lollipop rom (on my note 3) and wanted to switch to another rom or just have to lollipop ROMs at once, Multisystem helps me get that. Sorry for asking a lot. Just trying to understand.
BTW, I read the whole thread.