Sounds like you've progressed a bit since the first posting.  I dont know how youve been learning so far but I have a few tips on what helped me. If you have any questions feel free to ask

-Learn the basic chords and scales. Majors and Minors and the different ways of playing them. This is key to understanding the structure of all music especially Congolese music.  Most songs will follow the same patterns...literally. ie 1-4-5, 1-5-4-5 etc
-Building from the last point, learn basic theory, like when I say 1-4-5, that applies to any key you play in. The notes are different but the patterns for the most part are the exact same thing. 
-When you get some of that down try playing the chords and scales to the various songs and you will see how much they sound and play the same way.  The main thing that really distinguishes the music of most Congolese music in particular is the arrangement and maybe the solo...otherwise its the same thing.

Im not of Congolese origin but I've grown to love the music and while Im not an expert Im still learning after 5 years at it.  Check out my page...just did my own replay of some of my favorite Wenge solos: https://soundcloud.com/gary-desinord/wenge-musica-alain-makaba-maitre-ficcare

I agree with some of what you guys say as far as it sounding similar to older work but I think the sound that they have is the best of all bands.  I dont understand the lyrics at all but as a musician and going simply off of the sound of the musicians and the arrangement...to me hands down the extra musica (roga-roga) has mastered the heavy groove. Their only weakness is they havent branched from it.  With that said to, I think the grooves from the ARC ad was a better generique than any of the other releases by Werrason, Ferra and Fally

BG-ground & Zaiko,

You’ve watched many concerts of him but not many concerts of other Congolese Guitarists.  I don’t think you had a chance to watch Bongo Wende live. He dances while playing guitar...he can play SOLO GUITAR DURING A LIVE CONCERT WITH HIS TEETH WITHOUT MESSING UP(yes...you read me...I said TEETH LOL  ). Have you ever seen that? Yves Demukuse dances and jumps while playing. Safro Manzangi was always dancing (from the beginning to the end of a seben). Alain Makaba is one of the best; I like him and love how his guitar sounds. Just keep in mind there are some Guitarists that are not very comfortable dancing while playing but they are genius (like Rigo Star, Popolipo, Dally Kimoko, Huit Kilos, etc).

Ive watched videos from all of those guys.  Its not simply dancing that I'm referring exactly.  The overall ease that he plays pretty complex solos, his past work and the shift in sound he helped usher into soukous.  Im no expert on the solo guitar but I play. There are are a handful of soloist that Ive found it pretty challenging to play their work and his is one of them. He was the last before the Kapayas

Does anyone know where I could find the full DVD of this concert

I wish I understood Lingala to address what he was talking about, but Ive heard that argument from others I know that listen to both styles.  I would only say remember where coupe decale came from.  At the end of the day, most other west African styles were influenced a bit by rhumba/soukous.  When you listen to the progression of Congolese music from the 60s to today, you can hear its influence especially in the francophone countries.  You can hear it heavy in Cote d'Ivoire and Cameroon the most but today's Nigerian and Ghanian artist have studied the playbook too.

Being that I dont speak the languages, I can say anything about the content of the songs but the structure of coupe decale is similar to that of soukous too.  All they did was use electric drum kits (similar to what was done in the early 90s in soukous) and eliminated some of the instruments and speak french only.  Coupe Decale has just drums, bass, and usually one or two guitars max with a synthesizer.  That guitar usually functions similar to what the rhythm and lead would do in soukous.

In essence what I am saying is that coupe decale is nothing but an off branch version of soukous. 

Any word on where he will be appearing in the US?