It also is that some "insiders" tip picks on places like Twitter...often as soon as the card is sent in by a teams front office and they have a source. So the "tip" make make it out sometimes 3-5 minutes before the pick is actually in and ready. Add another few minutes if they cut to commercial. On a night like tonight they may have 2-4 picks out before the first is announced. It gets confusing especially when people just put a name in chat with no context. You may will have discussions about multiple picks, no context, what's coming all at the same time.
Waiting until the pick is announced gives some order and balance to the conversation.