[Suzu]

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Originally Posted by Helios

Isn't the Leangle Buckle supposed to be like the next generation driver for the Blade series

Well, yes and no. The next gen belts used in Missing Ace were designed like the Leangle buckle, but they were working with different cards. Unlike the Leangle buckle, which was designed to work with a sealed Undead, the belts used by Glaive, Larc and Lance were made to work with the Change Cerberus Rouse Card, which was an artificial card created by BOARD before the events of Missing Ace.

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Originally Posted by OathToOblivion

I...seem to recall that the reason it wasn't sealed properly was because it threw the fight? Been a while since I've seen any Blade.

Spider Undead let itself be sealed on purpose because it was an ally of Isaka. Due to the fact that it let Garren win instead of being actually defeated, the seal became improper, meaning the Undead sealed still had its own conciousness and could control the host aka Mutsuki.
Mutsuki ultimately defeated Spider Undead with some help of Tarantula Undead/Shima-san and Tiger Undead/Hikaru and sealed it properly so that he could control the power of Leangle.

Don't worry, I've seen the show 3 times and still have to look some details up.