Zhudi is spot on here if you make a couple of minor changes. If he replaces the word, ‘radical’ with the word ‘Kinetic’ and exchanges the word ‘extremist’ with, ‘orthodox’ or ‘religious’ then he is actually great on this video linked here.
The main thing is, they distorted the timeline here. The Muslim Brotherhood is the parent organization of the other two. There is no merger, just a public admission that all these groups are identical but one was a beard for the other.
Video here duration 2:35