Honestly, there is little functional difference between having a 2nd fan in dock, and running the same fan at higher speed.
In fact, the portable unit could have a built in fan, but not actually use it in mobile mode. Or have 2 fans, but only use 1.
( to save power, and for noise reasons when it is being held a foot from your face, vs. in a dock 6 feet away from you)
Just suggesting a way the two leaks/rumors are more compatable than they seem at first.