The thread goes back to last Sunday. Cubano didn't know who the 'big fish' was. This dude's source in the Heat organization has been feeding him information on multiple fronts: PJ Tucker, Oladipo, Jae Crowder, etc. The trade proposals for the so-called 'big fish' were submitted before the KD news broke today. And those trade proposals line up with multiple news reports from this week.
KD was a separate contingency that just broke today. This guy's source is now revealing what's going on around KD too, but that's separate from the discussion that was going on all week.
Miami chasing Mitchell and chasing KD are not mutually exclusive.