I don't know if more will be traded at the deadline or this offseason, but I will guess that just about all of them that ARE traded at the deadline are available now. If teams don't get the offers they want for Cease, Burnes, Luzardo, Bieber, they'll wait. And aside from Burnes who is on a one year deal, the price likely won't go down come July, because that's when the buyers are more desperate.
And this is not a disregard for risk mitigation, it's a long term look at risk mitigation. Pay today's prices up front for extended production, instead of paying more over a period of years for repeated short term production. That's pretty much how all owners wanted to pay every player between Bobby Bonilla and Shohei Ohtani. Give up a Brooks Lee now, or an Emmanuel Rodriguez every single year. It's a no brainer.