Hmm, hard to choose, I do rather like scotch...
Collaboration is always an option that the Q has curiously provided through its web interface. I've only ever used it once.
I would mention, as I am wont to do, that the trading headspace is an odd duck. On the media extolled side we have "proprietary algos potentially worth millions of dollars" -- so why would you ever think of sharing them (collaborating)? On the other side, the reality side, we have, as you've explained Grant, single disciplined individuals who would benefit greatly by teaming up with others who could then, as a group, build much better systems and strategies. I've run into this dichotomy time and time again.
"I can't share my secret trading technique."
"Yeah, but you can't code it yourself so you'll have to share it to build it."
"But, but, someone will steal it!"
"Right, so keep it to yourself then so that it will never actually make anyone money."
This philosophy may not be as prevalent here, it is after all a forum of algo writers. But I would point out how few of the leaderboard contestants actually participate here. So maybe it's more systemic than one might think. It's an intriguing situation.