Mate, there is a big difference between a 5 minutes montage video put together by a fan and a 40 minute, professional documentary.
Yes, I agree that most, including myself, are partly basing their excitement on the video, but that's because he comes across really well in it.
I agree with continuing the interview process, however, for me, if the other 2 candidates are Lambert, and say Poyet, then I would much prefer taking a risk with OGS and get it done now.