Yeah, a team would need assurances. It's hard enough, emotionally, to trade a talent like Arenado. And much more painful to a rival.He said he didn't even want the opt out when he signed the original deal, that probably could have been easily negotiated away, but it's hard to give up a ton of prospect value and take on a huge deal like that, especially when COL ruled out the most likely destination by far, LAD, because they didn't want Arenado kicking their ass in the division year after year.