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This... They were not really going to set up specific shots of him for a music video of a song he isn't really on. On a side note I noticed Dizzy was very high in the mix on live shows at the start of last tour and it actually worked on some of the AFD stuff, cant see how it would on YCBM though and obviously they, and probably he thought the same when it was recorded.

Yes, it was primarily filmed for the YCBM music video (but I'm not so sure the full concert was never intended for release, since the sound was professionally recorded, too). In addition, there was no (prominent, at least) piano or keyboard on any of the performed songs other than Estranged, and Dizzy's status in the band was not clear yet then (at least as far as the public was concerned), so probably the film crew figured he was just an "additional musician" and no shots of him were necessary except during Estranged.

I'd say the reason was explained pretty well right in the second post. 

Obviously not without having him replaced first.