JJJ,
If it is too cryptic, here is a condensed explanation.
EZkeys, while tailored for their "own" synths, as a program itself is just a fancy and convenient arpeggiator/phrase player with bunch of other features.

So... You can use MIDI phrases in EZkeys that were meant for completely different instruments (Strings, flutes, etc.) and since it has MIDI OUT function, you can hook it up to any other VST that has these Strings, flutes, etc. And you will get completely new usage out of EZkeys.

I hope that explains it.

Obviously, you can do this MIDI routing in any DAW. But the question is if you can do this in BIAB?
The workaround Dan shows is not of MIDI routing, but copying entire EZkeys timeline to any BIAB empty tracks, which involves these 4 steps:

1)Generating Chord Track on any empty BIAB mixer tracks
2)Dragging these block chords to EZ Keys
3)Replacing block chords with fancy grooves of EZkeys (from their MIDI packs OR from 3rd party packs)
4)Dragging that line back to any empty BIAB track.