vs
Original
I think I found a good compromise for blowing up those low res interviews to a larger resolution. Here are screen shots of the layout of both versions and the original.
I think it is better to resize the lower resolution interviews to only 704x528 and then have the rest of the right side of the frame is a 1216x528 movie clips resized from a cropped 1880x816 to maintain the correct aspect and fit the space. This way it shows more of the movie frame and resizes the interview window to a lower resolution window. It makes the interviews look better rather the blowing them 960x720 to take up half the screen. I think this works better then the complete split screen format.