Gotcha. I got it in my head they were going to use the single track on the west side while Brightline would use the other two tracks.The OIA station for SunRail will be a single low level platform two track separate new setup east of the Brightline Station. There is space set aside for that.
[I'll blame several aspects of this morphing repeatedly. At one point MiamiCentral had 8 tracks, then it was 6, then 5. And for some reason I thought the MCO station was planned, by the airport, as a "one and done" project vs two phases, and they'd just have to physically connect the tracks up...but the various "go west from MCO" projects have also changed a few times, too...]