Gregory Smith is not involved in the day-to-day of Qwiki because he's actually a television actor, and I assume he's too busy to be there all the time - he was the lead role on the WB series Everwood, Doug (Qwiki's CEO) knows him from when he worked at the WB. IIRC Gregory played a big part in coming up with the idea for Qwiki, and provided a lot (maybe all?) of the initial funding.

Jay Oh was the tech lead at Doug's previous startup, The U (http://www.theu.com), which shot and sold video tours of colleges (Gregory Smith and several other actors from the WB appeared in and helped promote many of these videos, so it's all very connected); I'm pretty sure they achieved a very nice exit from that when they sold and started to work on Qwiki. I don't know why Jay left Qwiki, specifically, but he's now one of the leads at http://howmutch.com/.

FWIW, I'm not part of Qwiki, but I was good friends with Doug when we were younger - on that note, just based on what I know about Doug, if I had to bet, I'd say that Qwiki has a very good shot here, regardless of what it looks like now. He has an impeccable business sense and will pivot without hesitation if it looks like he needs to, not to mention that he's one of the most driven people I've ever met in my life.

Euphemism for pushed aside, is my amateur guess.