No need to flash any extra stuff, stock rom do have everything inside package. And all components kernel, modem, recovery, bootloader, cache, and system also will update by simply flashing a rom.
Yeah sometimes you may get stuck at samsung logo or may device get bootloop after flashing a rom. At that time you needs wipe cache and wipe data (factory reset) from recovery. But this can happen with kies too. So i recommend to make backup of your important data before any kind of flashing.
Yes you will get update on kies and ota.
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